img {
    width: 100%;
    display: block;
}

a {
    text-decoration: none;
}

.main-container {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    overflow: hidden;
    padding: 0;
    background: #fff;
    position: relative;
    box-shadow: 0px 0px 10px rgba(50, 50, 50, 0.17);
}

.btn {
    width: 85%;
    max-width: 710px;
    position: fixed;
    margin: auto;
    top: 65%;
    bottom: 0;
    right: 0;
    left: 0;
}

@media (max-width: 768px) {
    .btn {
        top: 79%;
    }
}

footer {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    background: #000;
}

.copy {
    color: #fff;
    padding: 2%;
    font-size: 14px;
}