背景图片无法立即加载

Question

我正在尝试以...实际汉堡的形状制作汉堡菜单。 我唯一的小问题与扩展菜单上的“芝麻”背景图像有关。我设法找到了一个使用径向渐变图像的代码段，当您单击菜单图标并且菜单下拉时，直到完成转换后，才会显示白色的圆点背景图像。

我专门查看的代码是#menuList选择器上的背景图像行。

body {
  margin: 0;
  padding: 0;
  font-family: 'Open Sans', sans-serif;
}

a {
  text-decoration: none; /* no underlines */
}

#menuToggle {
  display: block;
  position: absolute;
  height: 36px;
  width: 36px;
  top: 20px;
  right: 20px;
  z-index: 1;
  color: #e5cb7a;
  
  -webkit-user-select: none;
  user-select: none; /* don't let 'em select text */
}

/* Style the "checkbox" used to activate the hamburger menu */
#menuToggle input {
  display: block;
  position: absolute;
  height: 32px;
  width: 32px;
  top: -7px;
  right: -7px;
  cursor: pointer; /* make the burger pointy */
  opacity: 0; /* hide the checkbox */
  z-index: 2;
}

/* Make the menu look like a triangle shape by adding a thick border next to it. */
#menuToggle::before {
  content: '';
  position: absolute;
  top: -10px;
  right: -10px;
  border-color: #e5cb7a; /* Bun-color */
  border-style: solid;
  border-width: 22px;
  border-radius: 8px;
}

/* Style the three spans that make up the hamburger */
#menuToggle span {
  display: block;
  position: relative;
  height: 4px;
  width: 30px;
  margin: 0px 0px 6px 9px;
  border-radius: 3px;
  
  z-index: 1;
  
  transition: transform 0.5s,
              opacity 0.55s ease;
}

/* Color the top span a lettuce color */
#topBun {
  background: #32c704;
}

/* Color the middle span a burger color */
#meat {
  background: #450101;
}

/* Color the bottom span a ketchup color */
#bottomBun {
  background: #ec3521;
}

/* Move the top bun down 10px (its height), then turn it */
#menuToggle input:checked ~ #topBun {
  background: #450101;
  transform: translate(0px, 10px) rotate(45deg);
}

#menuToggle input:checked ~ #meat {
  opacity: 0;
  transform: rotate(0deg);
}

/* Move the bottom bun up 10px (its height), then turn it */
#menuToggle input:checked ~ #bottomBun {
  background: #450101;
  transform: translate(0px,-10px) rotate(-45deg);
}

#menuList {
  display: inline-block;
  position: absolute;
  top: 0px;
  right: 0px;
  height: 100px;
  width: 100px;
  margin: -20px -20px 0 0;
  padding: 50px 90px 0 0;
  background: transparent;
  list-style-type: none; /* no bullets, weapon-free zone */
  /*-webkit-font-smoothing: antialiased;*/
  
  /* Sesame seeds for the top bun of the expanded menu */
  background-image: radial-gradient(white 20%, transparent 0);
  background-size: 15px 12px;
  background-position: 0 12px, 10px 10px;
  
  /* Shrink the actual menu list until the hamburger is opened */
  transform: translate(0px,-65px) scale(1,0.00001);
  transition: transform 1.5s, background 1.5s;
}

/* Make a larger burger bun shape around the expanded hamburger menu */
#menuList::before {
  content: '';
  position: absolute;
  top: 10px;
  right: 10px;
  border-style: solid;
  border-width: 90px;
  border-radius: 10px;
  z-index: -1;
}

#menuList li {
  padding: 3px 5px;
  font-size: 22px;
  text-align: center;
  width: 170px;
  color: #ffffff;
}

#menuList li:hover {
  font-weight: bold;
  letter-spacing: 2px;
}

/* Color the first menu option a lettuce color */
#about {
  background: #32c704;
}

/* Color the second menu option a burger color */
#info {
  background: #450101;
}

/* Color the third menu option a ketchup color */
#contact {
  background: #ec3521;
}

/* Transform the list back to its normal "visible" size when the input is checked */
#menuToggle input:checked ~ ul {
  transform: none;
}

<nav>
  <div id="menuToggle">
    <input type="checkbox" />
    <span id="topBun"></span>
    <span id="meat"></span>
    <span id="bottomBun"></span>
    
    <ul id="menuList">
      <a href="#"><li id="about">ABOUT</li></a>
      <a href="#"><li id="info">INFO</li></a>
      <a href="#"><li id="contact">CONTACT</li></a>
    </ul>
  </div>
</nav>

我已经放慢笔的过渡，以更好地说明问题所在。

如何使背景始终显示，而不是仅在菜单完全展开时显示？

CodePen

Answer 1

您展开的菜单“小圆面包”是边框，而不是背景，而背景是折叠的汉堡面包。

body {
  margin: 0;
  padding: 0;
  font-family: 'Open Sans', sans-serif;
}

a {
  text-decoration: none;
  /* no underlines */
}

#menuToggle {
  display: block;
  position: absolute;
  height: 36px;
  width: 36px;
  top: 20px;
  right: 20px;
  z-index: 1;
  color: #e5cb7a;
  -webkit-user-select: none;
  user-select: none;
  /* don't let 'em select text */
}


/* Style the "checkbox" used to activate the hamburger menu */

#menuToggle input {
  display: block;
  position: absolute;
  height: 32px;
  width: 32px;
  top: -7px;
  right: -7px;
  cursor: pointer;
  /* make the burger pointy */
  opacity: 0;
  /* hide the checkbox */
  z-index: 2;
}


/* Make the menu look like a triangle shape by adding a thick border next to it. */

#menuToggle::before {
  content: '';
  position: absolute;
  top: -10px;
  right: -10px;
  border-color: #e5cb7a;
  /* Bun-color */
  border-style: solid;
  border-width: 22px;
  border-radius: 8px;
}


/* Style the three spans that make up the hamburger */

#menuToggle span {
  display: block;
  position: relative;
  height: 4px;
  width: 30px;
  margin: 0px 0px 6px 9px;
  border-radius: 3px;
  z-index: 1;
  transition: transform 0.5s, opacity 0.55s ease;
}


/* Color the top span a lettuce color */

#topBun {
  background: #32c704;
}


/* Color the middle span a burger color */

#meat {
  background: #450101;
}


/* Color the bottom span a ketchup color */

#bottomBun {
  background: #ec3521;
}


/* Move the top bun down 10px (its height), then turn it */

#menuToggle input:checked~#topBun {
  background: #450101;
  transform: translate(0px, 10px) rotate(45deg);
}

#menuToggle input:checked~#meat {
  opacity: 0;
  transform: rotate(0deg);
}


/* Move the bottom bun up 10px (its height), then turn it */

#menuToggle input:checked~#bottomBun {
  background: #450101;
  transform: translate(0px, -10px) rotate(-45deg);
}

#menuList {
  display: inline-block;
  position: absolute;
  top: 0px;
  right: 0px;
  height: 100px;
  width: 100px;
  margin: -20px -20px 0 0;
  padding: 50px 90px 0 0;
  background: transparent;
  list-style-type: none;
  /* no bullets, weapon-free zone */
  /*-webkit-font-smoothing: antialiased;*/
  
  /* Shrink the actual menu list until the hamburger is opened */
  transform: translate(0px, -65px) scale(1, 0.00001);
  transition: transform 1.5s;
}


/* Make a larger burger bun shape around the expanded hamburger menu */

#menuList::before {
  content: '';
  position: absolute;
  top: 10px;
  right: 10px;
  bottom: -30px;
  left: 0;
  border-radius: 10px;
  z-index: -1;
  /* Sesame seeds for the top bun of the expanded menu */
  background-color: #e5cb7a;
  background-image: radial-gradient(white 20%, transparent 0);
  background-size: 15px 12px;
  background-position: 0 12px, 10px 10px;
}

#menuList li {
  padding: 3px 5px;
  font-size: 22px;
  text-align: center;
  width: 170px;
  color: #ffffff;
}

#menuList li:hover {
  font-weight: bold;
  letter-spacing: 2px;
}


/* Color the first menu option a lettuce color */

#about {
  background: #32c704;
}


/* Color the second menu option a burger color */

#info {
  background: #450101;
}


/* Color the third menu option a ketchup color */

#contact {
  background: #ec3521;
}


/* Transform the list back to its normal "visible" size when the input is checked */

#menuToggle input:checked~ul {
  transform: translate3d(0,0,0);
}

<nav>
  <div id="menuToggle">
    <input type="checkbox" />
    <span id="topBun"></span>
    <span id="meat"></span>
    <span id="bottomBun"></span>

    <ul id="menuList">
      <a href="#">
        <li id="about">ABOUT</li>
      </a>
      <a href="#">
        <li id="info">INFO</li>
      </a>
      <a href="#">
        <li id="contact">CONTACT</li>
      </a>
    </ul>
  </div>
</nav>