main {
    display: flex;
}

.categories {
    flex: 0 0 256px;
    display: flex;
    flex-direction: column;
    padding: 0 2rem;
}

.categories a {
    text-decoration: none;
    font-family: Dosis;
    text-align: center;
    text-transform: uppercase;
    margin-bottom: 1rem;
    background-color: #44b;
    color: white; 
    padding: 1rem;
}

.categories a:hover {
    background-color: #1a1a8b;
    box-shadow: 0 2px 5px -2px black;
}