body {
    margin: 0;
}

.menu {
    overflow: hidden;
    background-color: #ff55dd;
    /*position: fixed;
    top: 0;
    left: 0;
    width: 100%;*/
}

a.menu_item {
    display: block;
    color: black;
    text-decoration: none;
    text-align: center;
    padding: 15px;
}

a.menu_item:hover {
    background-color: #ff77ff;
}

.left {
    float: left;
}

.right {
    float: right;
}

.content {
    margin: 0;
    display: block;
    background-color: aqua;
}