.down-caret, .down-caret3, .color-mask {
    -webkit-transition: all linear 0.3s;
    -moz-transition: all linear 0.3s;
    -o-transition: all linear 0.3s;
    transition: all linear 0.3s;
}
.show-content:hover .color-mask {
    opacity:1!important;
}