html,body {
    margin: 0;
    padding: 0;
    background-color: #aaa;
    /*overflow: hidden;*/
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
} 

svg {
    width: 0px;
    height: 0px;
}

#mainMenu {
    position: relative;
    width: 1000px;
    max-width: 95%;
    margin: auto;
    background-color: #a8860b;
    border-style: solid;
    border-color: gold;
    border-radius: 0px 0px 6px 6px;
    border-width: 0px 3px 3px 3px;
    display: flex;
    justify-content: space-around;
    line-height: 2.5em;
    align-items: center;
}

#mainMenu a {
    position: relative;
    font-weight: bold;
    border: solid 2px #666666;
    border-radius: 5px;
    padding: 0px 3px;
    background-color: #bf8835;
    height: 2em;
    margin-top: 0.2em;
    line-height: 2em;
    text-decoration: none;
    color: black;
    /* white-space: nowrap; */
    z-index: 1;
}
#mainMenu a:hover {
    background-color: #fbbb5c;
}

#svg_home {
    width: 2em;
    height: 2em;
}

#page_content {
    position: relative;
    width: 1000px;
    max-width: 95%;
    height: calc(100% - 3em);
    bottom: 0;
    display: flex;
    background-color: #ccc;
    margin: auto;
    border-style: solid;
    border-width: 0px 2px;
    align-items: center;
    justify-content: center;
}
@media screen and (max-width: 900px) {
    #page_content {
        width: 100%;
    }
}
@media screen and (max-width: 700px) {
    #page_content {
        flex-wrap: wrap;
        border: 0;
        height: auto;
    }
}