I believe I understand what you're saying. Here is a codepen example that uses a CSS modal box instead. Check it out:

http://codepen.io/ShadyAlzayat/pen/LEDJg

The modal code is as follows:

.modal {
opacity: 0;
visibility: hidden;
position: fixed;
top: 0;
right: 0;
bottom: 0;
left: 0;
text-align: left;
background: rgba(0,0,0, .9);
transition: opacity .25s ease;
}

.modal__bg {
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
cursor: pointer;
}

.modal-state {
display: none;
}

.modal-state:checked + .modal {
opacity: 1;
visibility: visible;
}

.modal-state:checked + .modal .modal__inner {
top: 0;
}

.modal__inner {
transition: top .25s ease;
position: absolute;
top: -20%;
right: 0;
bottom: 0;
left: 0;
width: 50%;
margin: auto;
overflow: auto;
background: #fff;
border-radius: 5px;
padding: 1em 2em;
height: 50%;
}

.modal__close {
position: absolute;
right: 1em;
top: 1em;
width: 1.1em;
height: 1.1em;
cursor: pointer;
}

.modal__close:after,
.modal__close:before {
content: '';
position: absolute;
width: 2px;
height: 1.5em;
background: #ccc;
display: block;
transform: rotate(45deg);
left: 50%;
margin: -3px 0 0 -1px;
top: 0;
}

.modal__close:hover:after,
.modal__close:hover:before {
background: #aaa;
}

.modal__close:before {
transform: rotate(-45deg);
}

@media screen and (max-width: 768px) {

.modal__inner {
width: 90%;
height: 90%;
box-sizing: border-box;
}
}