.single {
    display: flex;
    justify-content: space-between;

}

.single article {
    flex: 1;
}

.single article img {
    display: block; 
    height: 20rem;
    max-width: 100%;
    object-fit: cover;
    border: 3px solid black;   
}

#toc {
    text-align: left;
}