.modal-window {
    position: fixed;
    background-color: #000000db;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 999;
    transition: all 0.3s;
}

.modal-window:target {
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
}

.modal-window > div {
    width: 80%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 2em;
    background: white;
}

.modal-window header {
    font-weight: bold;
}

.modal-window h1 {
    font-size: 150%;
    margin: 0 0 15px;
}

.modal-close {
    color: #aaa;
    line-height: 50px;
    font-size: 80%;
    position: absolute;
    right: 0;
    text-align: center;
    top: 0;
    width: 70px;
    text-decoration: none;
}

.modal-close:hover {
    color: black;
}

.modal-window > div {
    border-radius: .5rem;
}

.modal-window div:not(:last-of-type) {
    margin-bottom: 15px;
}

.btn {
    background-color: white;
    padding: 1em 1.5em;
    border-radius: 0.5rem;
    text-decoration: none;
}

.btn i {
    padding-right: 0.3em;
}