html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
}
#main{
    width: 100%;
    height: 100%;
    background-image: url("../img/show_project_background.jpg");
    background-size: 100% 100%;
}
.title {
    width: 70%;
    float: left;
    margin-left: 15%;
    margin-top: 15%;
}

.menu {
    width: 80%;
    height: 380px;
    float: left;
    margin-left: 10%;
    margin-top: 8%;
}

.menu-item {
    width: 46%;
    height: 150px;
    background-color: aliceblue;
    float: left;
    border-radius: 10px;
    overflow: hidden;
}

.item-icon {
    width: 100%;
    height: 110px;
    float: left;
    position: relative;
}

.item-title {
    width: 100%;
    height: 40px;
    line-height: 40px;
    font-size: 15px;
    float: left;
    text-align: center;
    background-image: url("../img/font-bg.png");
    background-size: 100% 100%;
}

.icon {
    height: 70px;
    position:absolute;
    top: 0;left:0;right:0;bottom:0;
    margin: auto;
}

.menu-item:nth-child(1),.menu-item:nth-child(3) {
    margin-right: 8%;
}
.menu-item:nth-child(3),.menu-item:nth-child(4) {
    margin-top:12%;
}