.categories {
    flex-basis: 256px;
    flex-grow: 0;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
}

.categories > a {
    text-decoration: none;
    font-family: 'dosis';
    text-align: center;
    text-transform: uppercase;
    margin-bottom: 1rem;
    color: white;
    background-color: #255;
}

.categories > a:hover {
    box-shadow: 0 2px 5px -2px black;
}