Bootstrap 3 Modal auto size, 30 pix from sides

Question

I'm trying to build modal window that will be positioned absolute, 30 pixels from edge of screen.

I've build this css:

.modal {
    overflow: hidden;
}
.modal-dialog {
    position: absolute;
    top: 50px;
    bottom: 50px;
    left: 50px;
    right: 50px;
    margin: 0;
}
@media (min-width: 768px) {
    .modal-dialog {
        width: auto;
        margin: 0;
    }
}
.modal-footer {
    position: absolute;
    bottom: 0;
    left:0;
    right:0;
}
.modal-header, .modal-body, .modal-footer {
    padding: 10px;
}
.modal-content {
    height: 100%;
    border-radius: 0;
    -webkit-box-shadow: none;
    box-shadow: none;
}
.modal-backdrop {
    background-color: #fff;
}
.modal-header .close {
    margin-top: 3px;
}
.btn {
    border-radius: 0;
}

and my results so far looks like this: http://jsfiddle.net/Misiu/LT3YM/

My modal window is correctly positioned, but modal-body isn't sizing, i would like it to take rest of available height of modal - from header to footer.
I can position absolute modal-body and add top and bottom properties, but I'm wondering if there is a better way of doing this.

My solution for now is this code:

.modal-body {
    position: absolute;
    top: 46px;
    bottom: 54px;
    overflow-y: scroll;
}

and demo of what I have:

How can I modify my code better so that modal-body will always be correct height? Is positioning it absolutely only option?

Answer 1

http://jsfiddle.net/LT3YM/4/

You should change the values in .modal-dialog. You can make bottom and right 30px too

.modal-dialog {
    position: absolute;
    top: 30px;
    bottom: 50px;
    left: 30px;
    right: 50px;
    margin: 0;
}

Alternatively, this uses 3%: http://jsfiddle.net/LT3YM/7/

.modal-dialog {
    position: absolute;
    top: 3%;
    bottom: 3%;
    left: 3%;
    right: 3%;
    margin: 0;
}

Looks like this: