.bookmark-icon {
    display: inline-block;
    cursor: pointer;
    
    background: rgba(255, 255, 255, 0.2);
    font-size: 20px;
    
    padding: 4px;
    border-radius: 50%;
    
    -moz-transition: transform .2s ease-in-out;
    -o-transition: transform .2s ease-in-out;
    -webkit-transition: transform .2s ease-in-out;
    -ms-transition: transform .2s ease-in-out;
    transition: transform .2s ease-in-out;
}

.bookmark-icon:hover {
    transform: scale(1.2);
}

.bookmark-icon .icon-star {
    color: #da3d2c;
}

.bookmark-icon .icon-star-empty {
    color: #FFF;
}