.header {
  font-family:;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 140px;
  background: rgba(243, 0, 0, 0.8);
}

.header .wrap {
  margin: 0 auto;
  width: 90%;
  max-width: 69em;
}

.header h1,
.header .menu {
  display: inline-block;
  position: relative;
}

.header h1,
.header .menu a {
  line-height: 140px;
}

.header h1 {
  float: left;
  margin: 0;
  color: #ffef6c;
  font-family: $font-heading;
  font-size: 50px;
  text-transform: uppercase;
}

.header .menu {
  float: right;

  a {
    margin: 0 10px;
    color: #fff;
    text-decoration: none;

    &:last-of-type {
      margin-right: 0;
    }
  }
}

/* Shrinking */
.header h1,
.header nav a {
  -webkit-transition: all 0.3s;
  -moz-transition: all 0.3s;
  transition: all 0.3s;
}

.header.shrink {
  height: 90px;
}

.header.shrink h1,
.header.shrink nav a {
  line-height: 90px;
}

.header.shrink h1 {
  font-size: 2em;
}

.slido {
  width: 70%;
  height: 70%;
}

.body {
  background-image: url("背景.png");
}

.what {
  text-align: center;
}

.contentsA {
  float: left;
  width: 45%;
}

.contentsB {
  float: right;
  width: 50%;
}

.main {
  overflow: hidden;
}

#footer {
  clear: both;
  font-size: 15px;
  border-top: #00c4ab 5px solid;
  border-bottom: #00c4ab 5px solid;
  clear: left;
  text-align: center;
  margin-bottom: 0px;
  width: 100%;
}