HTML_LearnC04_tryCSS

for Learning book demo use

by Loki Jiang

HTML

<div class="container">
  <div class="header">Header</div>
  <div class="left">Left</div>
  <div class="right">Right</div>
  <div class="footer">Footer</div>
</div>

CSS

/*主div垂直至中方式*/

body {
  /* ver4: 直接以父容器做內容保持水平垂直至中*/
  width: 100vw;
  height: 100vh;
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
}
.container {
  font-family: "Microsoft JhengHei";
  width: 1024px;
  height: 768px;
  border: 1px solid #000;
  color: white;
  font-size: 3rem;
  text-align: center;

  /* ver1: 因為已經有寬高，讓margin去center layout

  margin: auto;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  */

  /* ver2: 直接找畫面中心

  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  */

  /* ver3: 跟ver2相同，只是改px去調位置

  position: fixed;
  left: 50%;
  top: 50%;
  margin-left: -512px;
  margin-top: -384px;
  */
}
.header {
  width: 1024px;
  height: 100px;
  background: #000;
  line-height: 100px;
}
.left {
  width: 200px;
  height: 568px;
  background: #aaa;
  float: left;
  line-height: 568px;
}
.right {
  width: 824px;
  height: 568px;
  background: #777;
  float: right;
  line-height: 568px;
}
.footer {
  width: 1024px;
  height: 100px;
  background: #000;
  clear: both;
  line-height: 100px;
}