header{
    font-family: sans-serif;
    font-size: 30px;
}
#mainContainer {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    padding: 30px 20px;
}
#aside {
    flex: 0 0 30%;
}
#aside > a{
    display: block;
    font-family: sans-serif;
    font-size: 16px;
    text-decoration: none;
    cursor: pointer;
    color: black;
    margin-bottom: 10px;
}
#aside > a:hover{
    text-decoration: underline;
}
main{
    flex: 0 0 70%;
}
.item--main{
    position: relative;
}
main img{
    max-width: 100%;
}