$top-height: 100px;
.page{
  >.top{
    height: $top-height;
    .logo{
      height: 40px;
      line-height: 40px;
      font-size: 24px;
      font-weight: bold;
      padding-left: 20px;
      color: #666;
    }
  }
  >.main{
    width: 100%;
    height: calc(100vh - #{$top-height});
  }
  
.head{
  position: absolute;
  left: 1800px;
  top: 0px;
}
}