.modal {
    display: none; /* Hidden by default */
    position: fixed; /* Stay in place */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    overflow: auto; /* Enable scroll if needed */
    background-color: rgba(0, 0, 0, 0.4); /* Black w/ opacity */
    z-index:999;
}

.modal-content {
    /* background-color: #000000;*/
    margin: 100px auto; /* 15% from the top and centered */
    padding: 20px;
    border: 1px solid #888;
    width: 90%; /* Could be more or less, depending on screen size */
    max-width: 750px; /* Max width for better readability */
    position: relative;
}

.close-button {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
}

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