footer{
    display: block;
    background-color: #f0f0f0;
    text-align: center;
    margin-top: auto; /* Pushes the footer to the bottom if main-content has flex: 1 */
    width: 100%;
    height: 75px;
    line-height: 75px;    
    /* Remove position: absolute; and bottom: 0; */
}