.modal {
    display: none;
    position: fixed;
    z-index: 3;
    padding-top: 10em;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgb(0,0,0);
    background-color: rgba(0,0,0,0.4);
}
.close {
    color: #aaaaaa;
    float: right;
    font-size: 2em;
    font-weight: bold;
}

.close:hover,
.close:focus {
    color: #000;
    text-decoration: none;
    cursor: pointer;
}