.easy-intro-mask {
    position: absolute;
    z-index: 2;
    background: rgba(0,0,0, 0.5);
}
#easy-intro-mask-top-center {
    border-bottom: 4px #fff dashed;
}
#easy-intro-mask-left {
    border-right: 4px #fff dashed;
}
#easy-intro-mask-right {
    border-left: 4px #fff dashed;
}
#easy-intro-mask-bottom-center {
    border-top: 4px #fff dashed;
}
#easy-intro-mask-full {
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background: transparent;
}
#easy-intro-desc {
    position: absolute;
    color: white;
    text-align: center;
    z-index: 3;
    font-size: 20px;
}
#easy-intro-btn {
    z-index: 4;
    position: absolute;
    width: 50px;
    height: 50px;
    animation: moveUp 1s cubic-bezier(0.01, 0.35, 0.94, 0.49) 1s infinite;
}
#easy-intro-arrow {
    z-index: 4;
    position: absolute;
    width: 50px;
    height: 50px;
}