.modal p {
    margin: 10px;
}
.modal .mBlock {
    margin: 0;
    background: #fff;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-right: -50%;
    transform: translate(-50%, -50%);
    padding: 20px;
    border-radius: 5px;
}
.modal .btn {
    position: relative;
    left: 50%;
    transform: translate(-50%, -50%);
    margin-top: 50px;
}