.navbar {
    overflow: hidden;
    position: fixed;
    /* Set the navbar to fixed position */
    top: 0;
    /* Position the navbar at the top of the page */
    width: 100%;
    /* Full width */
}

ul.mainmenu {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #81a297;
}

ul.mainmenu li {
    float: left;

}

ul.mainmenu li.active {
    float: left;
    background-color: grey;
}

ul.mainmenu li a {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

ul.mainmenu li a:hover {
    background-color: #ff0000;
}

#main_logo {
    margin: auto;
    display: flex;
    justify-content: center;
}

#block-A {
    background-color: lightblue;
}

#block-B {
    background-color: whitesmoke;
}

#content-block-A {
    background-color: lightblue;
    width: 50%;
    /* height: 10%; */
    margin-left: 25%;

}

#content-block-B {
    background-color: whitesmoke;
    width: 50%;
    /* height: 10%; */
    margin-left: 25%;
}

#contact-footer {
    margin: auto;
    display: flex;
    justify-content: center;
    background-color: #81a297;
}