*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

header {
    background-color: #CCFFEE;
}

.site-cont {
    padding: 20px;
    text-align: center;
}

nav {
    display: flex;
    flex-direction: row;
    justify-content: flex-end;
    padding-right: 50px;
    background-color: aquamarine;
}

nav a {
    padding: 15px;
    color: indigo;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s ease;
}

nav a:hover {
    background-color: cadetblue;
    color: white;
    box-shadow: 0 5px indigo;
}

.nav-active {
    background-color: #DCADFF;
    box-shadow: 0 5px indigo;
}

main {
    display: flex;
    flex-direction: row;
}

section {
    margin: 20px;
    padding: 10px;
}

aside {
    width: 40%;
    min-width: 90px;
    margin: 20px 30px 20px 20px;
    padding: 20px;
    background-color: cadetblue;
}

aside ul {
    text-indent: 15%;
    list-style-type: none;
}

aside li {
    margin: 5px;
}

aside ul ul {
    text-indent: 30%;
}

aside a {
    color: darkblue;
    text-underline-offset: 3px;
    transition: all 0.3s ease;
}

aside a:hover {
    color: aliceblue;
    text-decoration-style: dotted;
}

.aside-active {
    text-decoration-style: double;
    font-weight: bold;
    color: brown;
    text-decoration: underline;
}

.crumbs {
    margin: 10px;
}

.crumbs a {
    color: #5D0001;
    text-decoration: none;
    transition: all 0.3s ease;
}

.crumbs a:hover {
    color: blueviolet;
}

@media only screen and (max-width: 880px) {

    nav {
        padding-right: 0;
        justify-content: center;
    }

    aside {
        margin: 20px 15px 20px 10px;
        padding: 10px;
    }

    section {
        margin: 10px;
        padding: 5px;
    }

    main {
        flex-direction: column;
    }
}
.visually-hidden {
    position: absolute;
    clip: rect(0 0 0 0);
    width: 1px;
    height: 1px;
    margin: -1px;
    overflow: hidden;
}

/* Make skip link visible when focused */
.visually-hidden:focus {
    position: absolute;
    clip: auto;
    width: auto;
    height: auto;
    margin: 0;
    overflow: visible;
    top: 10px;
    left: 10px;

    font-family: Arial, Helvetica, serif;
    font-size: 16px;
    color: #c5283d;
    background-color: #e8e1f3;
    padding: 8px 12px;
    text-decoration: none;
    border: 2px solid #4b2e83;
    z-index: 1000;
}