.mainDiv {
  width: 1180px;
  max-width: 1180px;
  min-width: 1180px;
  margin: 0 auto;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  background-color: #f5f7fa;
}
.title {
  font-size: 24px;
  font-weight: 500;
  color: rgba(51, 51, 51, 1);
  line-height: 33px;
}
.list{
    display: flex;
    flex-wrap: wrap;
}
.list a{
    width: 180px;
    height: 104px;
    border-radius: 4px;
    cursor: pointer;
    border: 1px solid rgba(246, 246, 246, 1);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin: 20px 20px 0 0;
    background: url(../images/cert-item-bg.png) no-repeat center/cover;
    transition: transform 0.5s;
}
.list a:hover{
    transform: translateY(-4px);
    box-shadow: 0px 8px 16px 0px rgb(0 0 0 / 6%);
}
.list a:link,a:visited{
    color: rgba(41, 43, 51, 0.8);
    text-decoration: none;
}
.list a:nth-child(6n){
    margin-right: 0;
}
.list a img{
    width: 32px;
    height: 32px;
    border: none;
}
.list a span{
    font-size: 16px;
    color: rgba(51, 51, 51, 1);
    margin-top: 10px;
}