.modal {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    display: none;
    overflow: auto;
    background-color: #000000;
    background-color: rgba(0, 0, 0, 0.6);  /*   how much will background be hidden. bigger value , darker the site at the background*/
    z-index: 9999;
}

.modal-window {
    position: relative;
    background-color:#ffffff;   /*  inside modal window's background color behind texts */
    width: 80%;
    margin: 15% auto;
    padding: 20px;
}

.modal-windowsm {
    position: relative;
    background-color: #ffffff;   /*  modal window's background color behind texts */
    width: 50%;
    margin: 15% auto;
    padding: 15px;
}

.modal-window.small {
    width: 75%;
}

.modal-window.large {
    width: 75%;
}

.close {
    position: absolute;
    top: 0;
    right: 0;
    color: rgba(0,0,0,0.3);
    height: 30px;
    width: 30px;
    font-size: 30px;
    line-height: 30px;
    text-align: center;
}

.close:hover,
.close:focus {
    color: #000000;
    cursor: pointer;
}

.open {
    display: block;
}

button { 
padding: 10px; 
background: indianred; 
color: #FFF; 
border: none 
width: 70px;
}
.subheading { font-style: italic }