.stm-animate-block {
    position: relative;
}

.stm-animate-block .animate-bg {
    position: absolute;
    top: 0;
    width: 50%;
    height: 100%;
    transition: .4s ease-in-out;
}

.stm-animate-block .animate-bg.stm-animate-1 {
    left: 0;
}

.stm-animate-block .animate-bg.stm-animate-2 {
    right: 0;
}

.stm-animate-block .stm-mask {
    position: absolute;
    top: 0;
    width: 50%;
    height: 100%;
    z-index: 4;
    transition: .4s ease-in-out;
}

.stm-animate-block .stm-mask.stm-animate-mask-1 {
    left: 0;
}

.stm-animate-block .stm-mask.stm-animate-mask-1:hover ~ .stm-animate-1 {
    z-index: 1;
    width: 100%;
}

.stm-animate-block .stm-mask.stm-animate-mask-2 {
    right: 0;
}

.stm-animate-block .stm-mask.stm-animate-mask-2:hover ~ .stm-animate-2 {
    z-index: 1;
    width: 100%;
}

.stm-animate-block .stm-animate-text {
    position: absolute;
    width: 1200px;
    max-width: 100%;
    padding: 0 15px;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    z-index: 2;
}

.stm-animate-block .stm-animate-img {
    position: relative;
    z-index: 3;
    text-align: center;
}

.stm-animate-block .stm-animate-img img {
    display: inline-block;
}