.modal 
{
    display: none;
    position: fixed;
    z-index: 4;
    padding-top: 80px;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgb(0,0,0);
    background-color: rgb(0,0,0,0.9);

}
.modal-content
{
   margin: auto;
    display: block;
    height: auto;
}
.close{
    position: absolute;
    top: 15px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
}
@media only screen and (max-width:700px)
{
    .modal{
            padding-top: 0px;
    }
    .modal-content{
        width: 100%;
        height: auto;
        position: relative;
        top: 50%;
        transform: translateY(-50%);

    }
}