body {
    font-family: Arial;
    padding: 20px;
    background: white;
}

.header {
    padding: 30px;
    font-size: 40px;
    text-align: center;
    background: rgb(206,108,31);
    color: white;
}

section header {
    margin-top: 10px;
    margin-bottom: 10px;
}

section header h4 {
    margin-bottom: 0px;
}
section header h5 {
    margin-top: 0px;
}

#wrapper {
    display: flex;
}

#left {
    flex: 0 0 15%;
}

#right {
    flex: 1;
}

#wrapper_tomb {
    display: flex;
    flex-direction: column;
    flex-wrap: wrap;
}
.leftcolumn {
    float: left;
    width: 85%;
    overflow:hidden;
}

.rightcolumn {
    width: 15%;
    margin-left: 1%;
    overflow:hidden;
}

.leftcolumn_tomb {
    float: left;
    width: calc(50% - 2em);
    margin: 1em;
    overflow:hidden;
    justify-content:center;
}

.rightcolumn_tomb {
    width: 50%;
    overflow:hidden;
    justify-content:center;
}

.img_container {
    background-color: white;
    padding: 20px;
    margin-top: 20px;
}

.img2_container {
    background-color: white;
    padding: 0px;
    margin-top: 0px;
}

img.imag {
    max-width=100%;
    width=100%;
    max-height=100%;
    height=100%;
    object-fit: contain;
    image-orientation: from-image;
}

figure.figure_index {
    padding: 0;
    margin: 0;
}
figure.figure_index_left {
    padding: 0;
    margin: 0;
    float: left;
}

ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    border: 1px solid #555;
}

li a {
    display: block;
    color: #000;
    background: #ddd;
    text-decoration: none;
    padding: 0;
}

li a:hover:not(.active) {
    background-color: #555;
    color: white;
    padding: 0;
}

li a.active {
    background-color: #4CAF50;
    color: white;
    padding: 0;
}

.row:after {
    content: "";
    text-align: center;
    background: #ddd;
    margin-top: 20px;
} 

figure {
    display: inline-block;
    margin: 20px;
}

figure img {
    vertical-align: top;
    margin-left: auto;
    margin-right: auto;
    display: block;
}

figure figcaption {
    text-align: center;
    margin: 5px;
}

@media screan and (max-width: 800px) {
    .leftcolumn, .rightcolumn {
        width: 100%;
        padding: 0;
    }
}