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html {
    overflow-y: scroll
}

body {
    height: 100vh;
    overflow: hidden
}

$('button').on('click', function() {
    $('html, body').animate({scrollTop: 0}, 400)
});

&_title {
    background-color: rgba(255,255,255,0.5)
  }

position: fixed;
top: 50%;
left: 50%;
transform: translate(-50%, -50%)

body {
    overflow: hidden
}

.row-tiles {
    overflow: auto
}