Question

我希望它在顶部有一个横跨页面宽度的标题，一个主要的内容部分，左侧有一个侧边栏，下面是一个页脚。不幸的是，当涉及固定，相对绝对和测量等时，我不是很好。所以它非常感激。

我确实使用了这里的一些代码：How to make a page with header and left-sidebar?

但是我编辑了它，因此测量是在em而不是px中进行的，因为它使设备上的可扩展性更高。

这是我当前的HTML布局

@import url('https://fonts.googleapis.com/css?family=Roboto');<!-- Custom Font -->
@charset "utf-8" @font-face {
  font-family: 'Roboto', sans-serif;
}


/*Layout for phones and tablets e.g. iPhone 5 and iPad*/


/*webpage fades in*/

html {
  animation: fadein 2s;
  position: relative;
  min-height: 100%;
}


/*animation*/

@keyframes fadein {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}


/*main colour settings for page*/

body {
  color: black;
  font-family: 'Roboto';
  background-color: #FFF;
  margin: 0 0 100px;
  padding: 25px;
}


/*Links*/

a,
a:link,
a:visited {
  color: black;
  text-decoration: none;
  transition: 1s;
}


/*Link hovering*/

nav a:hover {
  text-decoration: none;
  border: solid 1px black;
  border-radius: 5px;
  padding: 10px;
}


/*Main heading*/

h1 {
  font-size: 3em;
  max-width: 100%;
  max-height: 100%;
  text-align: center;
  position: absolute;
  left: 2em;
  right: 0;
  top: 0;
  height: 2em;
}


/*Secondary heading*/

h2 {
  font-size: 2em;
  max-width: 100%;
  max-height: 100%;
}


/*Text*/

p {
  font-size: 0.75em;
}


/*Images*/

img {
  max-width: 100%;
  max-height: 100%;
  margin: 0 auto;
  text-align: center;
  display: block;
}

#logo {
  float: left;
  margin-left: 10px;
  margin-top: 5px;
  max-height: 100px;
  max-width: 100px;
}

canvas {
  border: solid 1px black;
}


/*Footer*/

footer {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  overflow: hidden;
  text-align: center;
}

button {
  margin-bottom: 1em;
}


/*Main Body*/

#mainContent {
  position: absolute;
  left: 10em;
  top: 8em;
  right: 0;
  bottom: 1em;
  text-align: center;
}

#sideBar {
  position: absolute;
  left: 0;
  top: 8em;
  right: 0;
  bottom: 0;
  width: 10em;
  text-align: center;
  padding: 2em;
  border-right: solid 1px black;
  max-height: 2000px;
}

#sideBar img {
  max-width: 100px;
  max-height: 100px;
  margin-bottom: 2em;
}


/*Light Switches*/

#lightSwitchOff {
  display: inline;
  margin-top: 10px;
}

#lightSwitchOn {
  display: inline;
  margin-top: 10px;
}


/*Layout for desktop with a min-width of 1024px*/

@media only screen and (min-width: 1024px) {
  p,
  li {
    font-size: 1.5em;
  }
  h1 {
    font-size: 2.75em;
  }
  h2 {
    font-size: 2.25em;
  }
  #enter {
    max-width: 60%;
    max-height: 60%;
  }
}


/*Layout for desktop with a min-width of 1280px (720p HD)*/

@media only screen and (min-width: 1280px) {
  li {
    font-size: 1.5em;
  }
  h1 {
    font-size: 3em;
  }
  h2 {
    font-size: 2.25em;
  }
  #enter {
    max-width: 50%;
    max-height: 50%;
  }
}


/*Layout for desktop with a min-width of 1920px (1080p HD)*/

@media only screen and (min-width: 1920px) {
  p {
    font-size: 1.25em;
  }
  #enter {
    max-width: 40%;
    max-height: 40%;
  }
}


/*Layout for desktop with a min-width of 200px e.g. iMac*/

@media only screen and (min-width: 2000px) {
  p {
    font-size: 2em;
  }
}

<header>
  <h1>Sliding Game</h1>
</header>
<!--Closes Header -->

<div id="leftSideBar">
  <!-- Left Side Bar -->
  <h2>Select Image:</h2>
  <img src="images/dog.jpg" alt="Image Unvailable"></img>
  <img src="images/italy.jpg" alt="Image Unvailable"></img>
  <h2>Select Difficulty:</h2>
  <p id="easy">Easy</p>
  <p id="medium">Medium</p>
  <p id="hard">Hard</p>
  <button>Reset</button><br>
  <button>Randomise</button>
  <p>Timer:</p>
  <div id="timer">0</div><br>
</div>
<!-- Closes Left Side Bar -->

<div id="mainContent">
  <!-- Main Body -->
  <canvas id="game" width="600px" height="600px">Cavas is not available on your browser</canvas><br>
  <button id="start">Start</button>
  <div style="display: none">
    <img id="source" src="images/italy.jpg" alt="Image Unvailable">
  </div>
</div>
<!-- Closes Main Content-->

<div id="rightSideBar">
  <!-- Right Side Bar -->
  <h2>Leaderboard</h2>
</div>
<!-- Closes Right Side Bar -->

<footer>
  Website Created by Ryan Simms <br> 16024828@stu.mmu.ac.uk <br>
</footer>
<!-- Closes Footer -->

Answer 1

至于网页上元素的居中，我们建议您阅读以下指南：Centering in CSS: Complete guide,，您也可以使用Flexbox获得相同的结果：Complete guide to Flexbox.

至于标题，我已经为你制作了一些代码。您应该检查Bootstrap以便在网页上轻松定位元素。他们有固定底部和顶部的Navbars特定类。非常简单的框架！

.header {
  display: -webkit-box;      /* OLD - iOS 6-, Safari 3.1-6 */
  display: -moz-box;         /* OLD - Firefox 19- (buggy but mostly works) */
  display: -ms-flexbox;      /* TWEENER - IE 10 */
  display: -webkit-flex;     /* NEW - Chrome */
  display: flex;             /* NEW, Spec - Opera 12.1, Firefox 20+ */
  position: relative;
  background: #353535;
  width: 100%;
  height: 50px;
  margin: auto;
}

.text {
  display: flex;
  margin: auto;
  color: orange;
}

.container {
  display: flex;
  flex-direction: row;
  justify-content: space-around; 
  flex-wrap: wrap;
  height: 300px;
}
.div1 {
  display: flex;
  height: 150px;
  width: 32%;
  background: #353535;
  margin-top: 20px;

}
.div2 {
  display: flex;
  position: relative;
  height: 150px;
  width: 32%;
  background: #353535;
  margin-top: 20px;
}
.div3 {
  display: flex;
  position: relative;
  height: 150px;
  width: 32%;
  background: #353535;
  margin-top: 20px;
}

<div class="header">
  <h3 class="text">Your text here</h3>
</div>
<div class="container">
  <div class="div1"></div>
  <div class="div2"></div>
  <div class="div3"></div>
</div class="container">

如何制作带有页眉，左右边栏和页脚的网页？

1 个答案: