我的可折叠导航栏出现问题。我正在尝试使其导航栏下方的内容向下推送，以使其不会与网页上的内容重叠。我已经尝试了z-index，显示类型和似乎没有任何作用的所有内容。有人可以帮我吗？
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<h3>Construction</h3>
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<li><a href="html_categories/construction/const-a.html">Crane Rigging Angles</a></li>
<li><a href="html_categories/construction/const-b.html">Excavation and Earthwork Pressure</a></li>
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<h3>Dynamics</h3>
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<li><a href="html_categories/dynamics/dyn-a.html">Collision and Deformation: When Worlds Collide</a></li>
<li><a href="html_categories/dynamics/dyn-b.html">General Planar Motion: Armor Attack</a></li>
<li><a href="html_categories/dynamics/dyn-c.html">General Planar Motion: The Helicopter</a></li>
<li><a href="html_categories/dynamics/dyn-d.html">General Planar Motion: The Oil Rig</a></li>
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<h3>Fluids</h3>
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<li><a href="html_categories/fluids/flu-a.html">Fluid Properties</a></li>
<li><a href="html_categories/fluids/flu-b.html">Head Loss</a></li>
<li><a href="html_categories/fluids/flu-c.html">Hydrostatics</a></li>
<li><a href="html_categories/fluids/flu-d.html">Internal Flow and Losses</a></li>
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<h3>Heat Transfer</h3>
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<li><a href="html_categories/heat_transfer/heat-a.html">Conservation of Energy: Ice Melting Blocks</a></li>
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<h3>Material Science</h3>
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<li><a href="html_categories/material_science/matsci-a.html">Deformation: Bending a Knife Blade</a></li>
<li><a href="html_categories/material_science/matsci-b.html">Deformation: Shape Memory Alloys</a></li>
<li><a href="html_categories/material_science/matsci-c.html">Primary and Secondary Creep: Creepy Plastic</a></li>
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<h3>Mechanics</h3>
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<li><a href="html_categories/mechanics/mech-a.html">Axial Strain</a></li>
<li><a href="html_categories/mechanics/mech-b.html">Beam Bending: Foam Beam</a></li>
<li><a href="html_categories/mechanics/mech-c.html">Design of Axial Members</a></li>
<li><a href="html_categories/mechanics/mech-d.html">Elastic vs. Plastic</a></li>
<li><a href="html_categories/mechanics/mech-e.html">Load Conditions: Rubber Shapes</a></li>
<li><a href="html_categories/mechanics/mech-f.html">Paper Stress Concentrations</a></li>
<li><a href="html_categories/mechanics/mech-g.html">Shear Demonstrator</a></li>
<li><a href="html_categories/mechanics/mech-h.html">Stress/Strain: A Strainge Transformation</a></li>
<li><a href="html_categories/mechanics/mech-i.html">Stress/Strain Transformation: The Big Book of Shear</a></li>
<li><a href="html_categories/mechanics/mech-j.html">Thermal Expansion</a></li>
<li><a href="html_categories/mechanics/mech-k.html">Thin Wall Pressure Vessels - Balloons</a></li>
<li><a href="html_categories/mechanics/mech-l.html">Thin Wall Pressure Vessels - Hot Dogs</a></li>
<li><a href="html_categories/mechanics/mech-m.html">Thin Wall Pressure Vessels</a>
<li><a href="html_categories/mechanics/mech-n.html">Torsion: Tower of Torque</a></li>
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<section id="statics">
<h3>Statics</h3>
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<li><a href="html_categories/statics/stat-a.html">Concentrated Cable Loads: The Ski Gondola</a></li>
<li><a href="html_categories/statics/stat-b.html">Coulomb Friction: Fun with Friction</a></li>
<li><a href="html_categories/statics/stat-c.html">Force Vector: Amazing Weight Loss Program</a></li>
<li><a href="html_categories/statics/stat-d.html">Frame Demos</a></li>
<li><a href="html_categories/statics/stat-e.html">Friction: Belt Friction</a></li>
<li><a href="html_categories/statics/stat-f.html">Loading: Distributed Student Loading</a></li>
<li><a href="html_categories/statics/stat-g.html">Mechanical Advantage: Pulleys - Equilibrator Challenge</a></li>
<li><a href="html_categories/statics/stat-h.html">Mechanical Advantage: The Torque Tester</a></li>
<li><a href="html_categories/statics/stat-i.html">Moments: Lug Wrench vs. Breaker Bar</a></li>
<li><a href="html_categories/statics/stat-j.html">Moments: Moments and Couples</a></li>
<li><a href="html_categories/statics/stat-k.html">Moments: The Persuader</a></li>
<li><a href="html_categories/statics/stat-l.html">Moments: Varignon's I-Beam</a></li>
<li><a href="html_categories/statics/stat-m.html">Truss Design: K'NEX Trusses</a></li>
<li><a href="html_categories/statics/stat-n.html">Truss Design: Ruler Truss</a></li>
<li><a href="html_categories/statics/stat-o.html">Truss Design: Wacky Fun Noodle</a></li>
<li><a href="html_categories/statics/stat-p.html">Truss Design: Wooden Truss 2D</a></li>
<li><a href="html_categories/statics/stat-q.html">Truss Design: Wooden Truss 3D</a></li>
<li><a href="html_categories/statics/stat-r.html">Uniformly Loaded Cables</a></li>
<li><a href="html_categories/statics/stat-s.html">Zero Force Members</a></li>
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<h3>Thermodynamics</h3>
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<li><a href="html_categories/thermodynamics/therm-a.html">2nd Law - Direction</a></li>
<li><a href="html_categories/thermodynamics/therm-b.html">2nd Law - Losses</a></li>
<li><a href="html_categories/thermodynamics/therm-c.html">Boiling Point: The Hand Boiler</a></li>
<li><a href="html_categories/thermodynamics/therm-d.html">Boiling Properties</a></li>
<li><a href="html_categories/thermodynamics/therm-e.html">Closed vs. Open Systems</a></li>
<li><a href="html_categories/thermodynamics/therm-f.html">Conservation of Mass: Molasses Madness</a></li>
<li><a href="html_categories/thermodynamics/therm-g.html">Density and Buoyancy: The Lava Lamp</a></li>
<li><a href="html_categories/thermodynamics/therm-h.html">Otto Cycle: Engine Knock</a></li>
<li><a href="html_categories/thermodynamics/therm-i.html">Psychrometry</a></li>
<li><a href="html_categories/thermodynamics/therm-j.html">Total Energy - Fan Box</a></li>
<li><a href="html_categories/thermodynamics/therm-k.html">Total Energy</a></li>
<li><a href="html_categories/thermodynamics/therm-l.html">Vapor Power Cycle: The Little Engine That Could</a></li>
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<li><a href="html_categories/construction/const-a.html">Crane Rigging Angles</a></li>
<li><a href="html_categories/construction/const-b.html">Excavation and Earthwork Pressure</a></li>
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<h3>Dynamics</h3>
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<li><a href="html_categories/dynamics/dyn-a.html">Collision and Deformation: When Worlds Collide</a></li>
<li><a href="html_categories/dynamics/dyn-b.html">General Planar Motion: Armor Attack</a></li>
<li><a href="html_categories/dynamics/dyn-c.html">General Planar Motion: The Helicopter</a></li>
<li><a href="html_categories/dynamics/dyn-d.html">General Planar Motion: The Oil Rig</a></li>
<li><a href="html_categories/dynamics/dyn-e.html">General Planar Motion: The Slider</a></li>
<li><a href="html_categories/dynamics/dyn-f.html">General Planar Motion: The Tank</a></li>
<li><a href="html_categories/dynamics/dyn-g.html">Projectile Motion</a></li>
<li><a href="html_categories/dynamics/dyn-h.html">Rectilinear Motion</a></li>
<li><a href="html_categories/dynamics/dyn-i.html">Relative Motion: Choo Choo Train</a></li>
<li><a href="html_categories/dynamics/dyn-j.html">Rotation: No Slip Wheel</a></li>
<li><a href="html_categories/dynamics/dyn-k.html">Rotation and Moment of Inertia: A Day at the Races</a></li>
<li><a href="html_categories/dynamics/dyn-l.html">Rotational Kinematics: The Ferris Wheel</a></li>
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<h3>Fluids</h3>
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<li><a href="html_categories/fluids/flu-a.html">Fluid Properties</a></li>
<li><a href="html_categories/fluids/flu-b.html">Head Loss</a></li>
<li><a href="html_categories/fluids/flu-c.html">Hydrostatics</a></li>
<li><a href="html_categories/fluids/flu-d.html">Internal Flow and Losses</a></li>
<li><a href="html_categories/fluids/flu-e.html">Laminar and Turbulent Flow: Smoke Tunnel</a></li>
</ul>
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<section id="heattran">
<h3>Heat Transfer</h3>
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<li><a href="html_categories/heat_transfer/heat-a.html">Conservation of Energy: Ice Melting Blocks</a></li>
<li><a href="html_categories/heat_transfer/heat-b.html">Radiant Energy: Parabolic Concentrator</a></li>
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<section id="matsci">
<h3>Material Science</h3>
<ul>
<li><a href="html_categories/material_science/matsci-a.html">Deformation: Bending a Knife Blade</a></li>
<li><a href="html_categories/material_science/matsci-b.html">Deformation: Shape Memory Alloys</a></li>
<li><a href="html_categories/material_science/matsci-c.html">Primary and Secondary Creep: Creepy Plastic</a></li>
</ul>
</section>
</div>
<div id="box-6" class="boxes">
<section id="mechanics">
<h3>Mechanics</h3>
<ul>
<li><a href="html_categories/mechanics/mech-a.html">Axial Strain</a></li>
<li><a href="html_categories/mechanics/mech-b.html">Beam Bending: Foam Beam</a></li>
<li><a href="html_categories/mechanics/mech-c.html">Design of Axial Members</a></li>
<li><a href="html_categories/mechanics/mech-d.html">Elastic vs. Plastic</a></li>
<li><a href="html_categories/mechanics/mech-e.html">Load Conditions: Rubber Shapes</a></li>
<li><a href="html_categories/mechanics/mech-f.html">Paper Stress Concentrations</a></li>
<li><a href="html_categories/mechanics/mech-g.html">Shear Demonstrator</a></li>
<li><a href="html_categories/mechanics/mech-h.html">Stress/Strain: A Strainge Transformation</a></li>
<li><a href="html_categories/mechanics/mech-i.html">Stress/Strain Transformation: The Big Book of Shear</a></li>
<li><a href="html_categories/mechanics/mech-j.html">Thermal Expansion</a></li>
<li><a href="html_categories/mechanics/mech-k.html">Thin Wall Pressure Vessels - Balloons</a></li>
<li><a href="html_categories/mechanics/mech-l.html">Thin Wall Pressure Vessels - Hot Dogs</a></li>
<li><a href="html_categories/mechanics/mech-m.html">Thin Wall Pressure Vessels</a>
<li><a href="html_categories/mechanics/mech-n.html">Torsion: Tower of Torque</a></li>
</ul>
</section>
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<div id="box-7" class="boxes">
<section id="statics">
<h3>Statics</h3>
<ul>
<li><a href="html_categories/statics/stat-a.html">Concentrated Cable Loads: The Ski Gondola</a></li>
<li><a href="html_categories/statics/stat-b.html">Coulomb Friction: Fun with Friction</a></li>
<li><a href="html_categories/statics/stat-c.html">Force Vector: Amazing Weight Loss Program</a></li>
<li><a href="html_categories/statics/stat-d.html">Frame Demos</a></li>
<li><a href="html_categories/statics/stat-e.html">Friction: Belt Friction</a></li>
<li><a href="html_categories/statics/stat-f.html">Loading: Distributed Student Loading</a></li>
<li><a href="html_categories/statics/stat-g.html">Mechanical Advantage: Pulleys - Equilibrator Challenge</a></li>
<li><a href="html_categories/statics/stat-h.html">Mechanical Advantage: The Torque Tester</a></li>
<li><a href="html_categories/statics/stat-i.html">Moments: Lug Wrench vs. Breaker Bar</a></li>
<li><a href="html_categories/statics/stat-j.html">Moments: Moments and Couples</a></li>
<li><a href="html_categories/statics/stat-k.html">Moments: The Persuader</a></li>
<li><a href="html_categories/statics/stat-l.html">Moments: Varignon's I-Beam</a></li>
<li><a href="html_categories/statics/stat-m.html">Truss Design: K'NEX Trusses</a></li>
<li><a href="html_categories/statics/stat-n.html">Truss Design: Ruler Truss</a></li>
<li><a href="html_categories/statics/stat-o.html">Truss Design: Wacky Fun Noodle</a></li>
<li><a href="html_categories/statics/stat-p.html">Truss Design: Wooden Truss 2D</a></li>
<li><a href="html_categories/statics/stat-q.html">Truss Design: Wooden Truss 3D</a></li>
<li><a href="html_categories/statics/stat-r.html">Uniformly Loaded Cables</a></li>
<li><a href="html_categories/statics/stat-s.html">Zero Force Members</a></li>
</ul>
</section>
</div>
<section id="thermodynamics">
<div id="box-8" class="boxes">
<h3>Thermodynamics</h3>
<ul>
<li><a href="html_categories/thermodynamics/therm-a.html">2nd Law - Direction</a></li>
<li><a href="html_categories/thermodynamics/therm-b.html">2nd Law - Losses</a></li>
<li><a href="html_categories/thermodynamics/therm-c.html">Boiling Point: The Hand Boiler</a></li>
<li><a href="html_categories/thermodynamics/therm-d.html">Boiling Properties</a></li>
<li><a href="html_categories/thermodynamics/therm-e.html">Closed vs. Open Systems</a></li>
<li><a href="html_categories/thermodynamics/therm-f.html">Conservation of Mass: Molasses Madness</a></li>
<li><a href="html_categories/thermodynamics/therm-g.html">Density and Buoyancy: The Lava Lamp</a></li>
<li><a href="html_categories/thermodynamics/therm-h.html">Otto Cycle: Engine Knock</a></li>
<li><a href="html_categories/thermodynamics/therm-i.html">Psychrometry</a></li>
<li><a href="html_categories/thermodynamics/therm-j.html">Total Energy - Fan Box</a></li>
<li><a href="html_categories/thermodynamics/therm-k.html">Total Energy</a></li>
<li><a href="html_categories/thermodynamics/therm-l.html">Vapor Power Cycle: The Little Engine That Could</a></li>
</ul>
</div>
</section>
</div>
</div>
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<p>Tyler Kautz, Trevor Swann, Jacob Stambaugh. Copyright © 2019. Some Rights Reserved.</p>
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以下是崩溃.css的内容：
@font-face {
font-family: Raleway;
src: url(../font/Raleway-Regular.ttf);
}
html, body {
margin: 0;
padding: 0;
width: 100%;
color: black;
font-family: Raleway;
background-color: white;
}
/* Navigation */
.nav {
color: white;
height: 70px;
line-height: 70px;
text-align: left;
background-color: #222629;
border-bottom: 3px solid #86C232;
}
.menu a {
float: left;
text-decoration: none;
color: white;
line-height: 60px;
height: 60px;
padding: 5px 12.5px;
margin-bottom: -17px;
}
.menu a:hover {
background-color: #6B6E70;
text-decoration: underline;
text-decoration-color: #86C232;
}
.logo {
padding: 0 5px 0 5px;
font-size: 34px;
}
.logo a {
color: #86C232;
}
.logo a:hover{
background-color: #222629;
}
label{
margin: 0 0 0 20px;
font-size: 26px;
line-height: 70px;
display: none;
width: 26px;
float: left;
}
#toggle {
display: none;
}
/* Search Bar */
.search-bar-input {
float: right;
}
input[type=text] {
padding: 9px;
margin-top: 16px;
font-size: 17px;
border: none;
}
.search-bar-input button {
float: right;
padding: 9px 12px;
margin-top: 16px;
margin-right: 16px;
background-color: #86C232;
font-size: 17px;
border: none;
cursor: pointer;
}
.search-bar-input button:hover {
background-color: #6B6E70;
}
/* Content Div */
#welcome {
width: 100%;
height: auto;
}
.content {
margin: 0 12.5% 0 12.5%;
}
.categories-box-1, .categories-box-2 {
display: flex;
flex-direction: column;
}
h3 {
padding-left: 20%;
text-align: center;
text-decoration: underline;
}
.boxes {
margin: 10px;
width: 80%;
}
.boxes a{
text-decoration: none;
color: black;
}
.boxes ul {
padding-left: 35%;
}
.boxes ul li {
list-style: none;
padding: 5px 10px 5px 10px;
}
.boxes ul li a:hover {
border-bottom: 2px solid #86C232;
}
/* Footer */
.footer {
color: white;
float: left;
width: 100%;
text-align: center;
background-color: #222629;
}
/* Media Query */
@media only screen and (max-width: 1400px){
/* Navigation */
label{
display: block;
cursor: pointer;
}
.menu {
margin: 0;
width: 100%;
display: none;
text-align: center;
background-color: #222629;
}
.menu a {
float: none;
clear: left;
display: block;
border-bottom: 1px solid #EAEAEB;
margin: 0;
padding: 0;
}
.menu a:hover {
background-color: #6B6E70;
text-decoration: underline;
text-decoration-color: #86C232;
}
#toggle:checked + .menu {
display: block;
}
.logo {
float: right;
padding: 5px;
}
.logo a {
border: none;
}
/* Content */
.categories-box-1, .categories-box-2 {
display: flex;
flex-direction: column;
}
.boxes {
width: 95%;
}
.boxes ul {
padding-left: 20%;
}
}
@media only screen and (max-width: 680px){
content {
margin: 0 5% 0 5%;
}
.boxes ul {
padding-left: 20%;
}
}
@media only screen and (max-width: 480px){
.content {
margin: 0 2% 0 2%;
}
h3 {
padding-left: 0;
}
.boxes ul {
padding-left: 2%;
}
#toggle:checked + .menu {
display: block;
}
}
答案 0 :(得分：1)
您应该在.nav类上使用min-height属性而不是height，如下所示：
.nav {
...
min-height: 70px;
...
}
这将在打开菜单时下推内容。