h1 {color: #37c1b7;}
img {max-width: 100%;}
.menu a {border-bottom: 4px solid transparent;transition: .15s;}
.menu a:hover {border-bottom: 4px solid #37c1b7;}
.item {border: 3px solid #eee;cursor: pointer;opacity: 0.25;}
.item:hover {border: 3px solid #37c1b7;opacity: 1;}
.item.active {border: 3px solid #37c1b7;opacity: 1;}
.contents {height: calc(100% - 48px);}