.zt-flip-box-inner{
    margin-bottom: 15px;
    position: relative;
    text-align: center;
}
.zt-flip-box-front, .zt-flip-box-back{
    backface-visibility: hidden;
    background-clip: padding-box;
    padding: 27px 20px;
    perspective: 600px;
    text-align: center;
    transform-style: preserve-3d;
    -webkit-transform-style: preserve-3d;
    -ms-transform-style: preserve-3d;
    -o-transform-style: preserve-3d;
    transition: all 0.4s cubic-bezier(0.2, 0.85, 0.4, 1.275) 0s;
    -webkit-transition: all 0.4s cubic-bezier(0.2, 0.85, 0.4, 1.275) 0s;
    -ms-transition: all 0.4s cubic-bezier(0.2, 0.85, 0.4, 1.275) 0s;
    -o-transition: all 0.4s cubic-bezier(0.2, 0.85, 0.4, 1.275) 0s;
    box-sizing: border-box;
}
.zt-flip-box-front{
    transform: rotateY(0deg);
    -webkit-transform: rotateY(0deg);
    -ms-transform: rotateY(0deg);
    -o-transform: rotateY(0deg);
    z-index: 10;
}
.zt-flip-box-back{
    height: auto;
    left: 0;
    position: absolute;
    top: 0;
    transform: rotateY(-180deg);
    -webkit-transform: rotateY(-180deg);
    -ms-transform: rotateY(-180deg);
    -o-transform: rotateY(-180deg);
    width: 100%;
    z-index: -1;
}
.zt-flip-box-inner:hover .zt-flip-box-front {
    transform: rotateY(180deg);
    -webkit-transform: rotateY(180deg);
    -ms-transform: rotateY(180deg);
    -o-transform: rotateY(180deg);
    z-index: -1;
}
.zt-flip-box-inner:hover .zt-flip-box-back {
    transform: rotateY(0deg);
    -webkit-transform: rotateY(0deg);
    -ms-transform: rotateY(0deg);
    -o-transform: rotateY(0deg);
    z-index: 10;
}
.zt-flip-box-inner .zt-flip-box-circle .fa{
    width: 64px;
    height: 64px;
    display: inline-block;
    border-radius: 50%;
    line-height: 64px;
    font-size: 24px;
}
.zt-flip-box-inner .zt-flip-box-no-circle .fa{
    font-size: 60px;
}