.overlay {
    background-color: gray;
    height: 100vh;
    left: 0;
    opacity: 0.77;
    position: fixed;
    right: 0;
    top: 0;
    z-index: 50;
}

.dialog {
    background: #fff none repeat scroll 0 0;
    border: 4px solid #ccc;
    border-radius: 10px;
    box-shadow: 0 0 10px #222;
    height: 300px;
    left: 50%;
    margin-left: -250px;
    margin-top: -150px;
    padding: 10px;
    position: fixed;
    top: 50%;
    width: 500px;
    z-index: 50;
}

.dialog h1{
  margin-top: 0;
}