.header{
    background: rgba(0, 0, 0, 0.4)
}
.appList {
    background: #f5f5f5;
    padding-top: 50px;
}
.appList .container{
    background: #fff;
}

.appList h3 {
    margin: 35px 0 20px 0;
    text-align: center;
}

.appList h3>span {
    width: 4px;
    height: 23px;
    background: #1976d2;
    display: inline-block;
    position: relative;
    top: 4px;
    margin-right: 8px;
}

.appList .listItem img {
    box-shadow: 1px 1px 6px 2px #ccc;
    width: 100%;
}