* {
  margin: 0;
  padding: 0;
}
ul, li {
  list-style: none;
}
body > section {
  display: none;
  width: 600px;
  margin: 0 auto;
  padding: 20px;
  text-align: center;
}

.box1 {
  overflow: hidden;
  border: 1px solid #0aa;
}

img {
  display: block;
  width: 100%;
}

.box2 .box2_wrapper {
  position: relative;
  height: 337px;
}

.box2 .box2_wrapper svg {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  padding: 0;
  pointer-events: none;
}

.box3 .container {
  background: lightpink;
}

.box3 .container li {
  display: inline-block;
  width: 49%;
  height: 100px;
}

.box3 .container li:nth-child(1) {
  background: sandybrown;
}

.box3 .container li:nth-child(2) {
  background: slateblue;
}



.box3 header {
  height: 50px;
  background-color: red;
}

.box3 .container {
  height: 200px;
  overflow: hidden;
  padding: 0 200px;
}

.box3 .middle {
  width: 100%;
  height: 200px;
  background-color: #ECECEC;
  float: left;
}

.box3 .left {
  width: 200px;
  height: 200px;
  position: relative;
  left: -200px;
  margin-left: -100%;
  background-color: blue;
  float: left;
}

.box3 .right {
  width: 200px;
  height: 200px;
  position: relative;
  right: -200px;
  margin-left: -200px;
  background-color: yellow;
  float: left;
}

.box3 footer {
  height: 50px;
  background-color: black;
}


.box4 header {
  height: 50px;
  background-color: red;
}

.box4 .container {
  height: 200px;
  overflow: hidden;
}

.box4 .middle {
  width: 100%;
  height: 200px;
  background-color: #ECECEC;
  float: left;
}

.box4 .in {
  padding: 0 200px 0 200px;
}

.box4 .left {
  width: 200px;
  height: 200px;
  margin-left: -100%;
  background-color: blue;
  float: left;
}

.box4 .right {
  width: 200px;
  height: 200px;
  margin-left: -200px;
  background-color: yellow;
  float: left;
}

.box4 footer {
  height: 50px;
  background-color: black;
}