#header {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: rgb(0, 120, 20);
    font-size: 16pt;
    font-family:'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
}

.left {
    float: left;
}

.right {
    float: right;
}

.tabs .nav {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

.tabs .nav:hover {
    background-color:#072F15ff;
}

.tabs .robot img {
    margin-top: -5px;
    margin-bottom: -5px;
    width: 45px;
    height: 30px;
}

header {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
}