* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
.page {
    width: 900px;
    margin: 0 auto;
}
.header {
    height: 100px;
    background-color: #B2D6FF;
}
.menu {
    float: left;
    width: 250px;
    height: 300px;
    background-color: #F09A9D;
}
.content {
    float: left;
    width: 650px;
    height: 520px;
    background-color: #F5CF8E;
    padding: 20px;
    line-height: 1.6;
}
.footer {
    clear: both;
    height: 400px;
    background-color: #D6E9FE;
}