进阶实战 css 点击按钮的样式

1.  html结构

<div class="menu-wrap">
    <input type="checkbox" class="toggler">
    <div class="hamburger"><div></div></div>
    <div class="menu">
      <div>
        <ul>
          <li><a href="#">Home</a></li>
          <li><a href="#">About</a></li>
          <li><a href="#">Serices</a></li>
          <li><a href="#">Contact</a></li>
        </ul>
      </div>
    </div>
  </div>

2. css 样式

.menu-wrap {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1;
}
.menu-wrap .toggler {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 2;
  /* 控制光标的类型 */
  cursor: pointer;
  width: 60px;
  height: 60px;
  opacity: 0;
}
.menu-wrap .hamburger {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  width: 60px;
  height: 60px;
  padding: 1rem;
  background: var(--primary--color);
  display: flex;
  justify-content: center;
  align-content: center;
}
/* hamburger line */
.menu-wrap .hamburger > div {
  position: relative;
  flex: none;
  width: 100%;
  height: 2px;
  background: #fff;
}

/* hamburger liner -- top & bottom */
.menu-wrap .hamburger > div:before,
.menu-wrap .hamburger > div:after{
  content: '';
  position: absolute;
  z-index: 1;
  background: #fff;
  width: 100%;
  height: 2px;
  top: 20px;
}

.menu-wrap .hamburger > div:after {
  top: 10px;
}

3. 重点

伪类选择器

:before 选择器在被选元素的内容前面插入内容.

:after 选择器在被选元素的内容前面插入内容.