.content{display: block; clear: both;}
  .content .box{}
  .content .box a{width: calc(100% / 2 - 5px); display: block; float: left; text-align: center; background-color: #009688; color: #fff; margin-right: 10px; height: 40px; line-height: 40px; text-decoration: none;margin-bottom: 20px;}
  .content .box a:nth-child(2n){margin-right: 0;}