html {
    background: #1c1c1c;
    color: #bdbdbd;
    font-family: Calibri, serif;
}

h1, h2, h3 {
    color: #6b0c0f;
}

a {
    color: #bdbdbd;
}

table {
    border-collapse: separate;
    border: 1px solid #545454;
    border-radius: 7px;
    margin-left: 30px;
}

th {
    text-align: left;
    padding: 2px 5px 2px 5px;
    border-bottom: 1px solid #545454;
}

td {
    padding: 2px 15px 2px 5px;
    vertical-align: top;
}

div {
    /*border: 1px solid white;*/
}

button {
    background: #3b3b3b;
    color: #bdbdbd;
    border: 0;
    padding: 5px 10px;
    border-radius: 3px;
    cursor: pointer;
}

#container {
    display: grid;
    grid-template-columns: 300px minmax(300px, 930px);
    column-gap: 50px;
}

#navigation {
    grid-column-start: 1;
}

.nav-button {
    background: #3b3b3b;
    color: #bdbdbd;
    padding: 5px 15px 5px 15px;
    cursor: pointer;
    border-radius: 7px;
    width: 200px;
    margin-bottom: 5px;
}

.nav-button.selected {
    background: #bdbdbd;
    color: #3b3b3b;
}

#content {
    grid-column-start: 2;
}

.text-centered {
    text-align: center;
}

.offset-to-table {
    display: inline-block;
    margin-left: 32px;
    margin-top: 4px;
}

.indent {
    margin-left: 40px;
}

.exercise-container {
    position: relative;
    margin-top: 20px;
    border: 1px solid #545454;
    border-radius: 7px;
    padding: 0 15px 15px 15px;
}

.exercise-container > table {
    border: 0;
}

.vocabulary {
    position: relative;
    float: right;
    top: 25px;
}

.vocabulary table {
    margin-right: 15px;
    border-color: #6b0c0f;
}