body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}
.header{
    background: #fff;
    height: 2em;
    line-height: 2em;
}
.header div{
float: left;
padding-left: 2em;
}
.header nav{
float: right;
padding-right: 2em;
}
.container {
    width: 80%;
    margin: 0 auto;
    padding: 20px;
    background: #fff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}
h1, h2, h3 {
    color: #333;
}
p {
    margin: 0 0 20px;
}
.footer {
    text-align: center;
    margin: 20px 0;
    font-size: 0.9em;
    color: #666;
}
.header-banner{
    height: 5em;
    color: red;
}