/* menu part */
.menu {
    border-top: double 5px silver;
    border-bottom: double 5px silver;
    text-align: right;
}

.menu-item {
    display: inline-block;
    width: 8%;
    height: 3em;
    line-height: 3em;
    text-align: center;
    vertical-align: middle;
    margin: 0 1%;
    overflow: hidden;
    text-overflow: ellipsis ;
}

.menu .selected {
    color: green;
    font-weight: bold;
    border-left: double 5px silver;
    border-right: double 5px silver;
}

.menu .menu-header {
    color: green;
    font-weight: bold;
    float: left;
}

.menu a {
    color: black;
}

/* 4 images part */
.images-container{
    width: 90%;
    height:20%;
    margin:auto; 
    overflow: hidden;
    margin: 1%;
}

.images-container .half-size{
    float: left;
    width: 50%;
    height: 100%;
}

.images-container .quarter-size{
    float: left;
    width: 25%;
    height: 100%;
}

.images-container .image-column-container{
    float: left;
    width: 25%;
    height: 100%;
}

.images-container img{
    width: 100%;
    height: 100%;
}

.image-column-container div{
    height: 50%;
}