button {
    margin: 20px;
}

.custom-btn {
    width: 150px;
    height: 50px;
    color: #fff;
    border-radius: 5px;
    padding: 10px 25px;
    font-family: 'Lato', sans-serif;
    font-weight: 500;
    background: transparent;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    display: inline-block;
    box-shadow: inset 2px 2px 2px 0px rgba(255,255,255,.5), 7px 7px 20px 0px rgba(0,0,0,.1), 4px 4px 5px 0px rgba(0,0,0,.1);
    outline: none;
}

.btn-12 {
    position: relative;
    right: 20px;
    bottom: 20px;
    border: none;
    box-shadow: none;
    line-height: 42px;
    -webkit-perspective: 230px;
    perspective: 230px;
}

    .btn-12 span {
        background: rgb(0,172,238);
        background: linear-gradient(0deg, rgba(0,172,238,1) 0%, rgba(2,126,251,1) 100%);
        display: block;
        position: absolute;
        width: 130px;
        height: 40px;
        box-shadow: inset 2px 2px 2px 0px rgba(255,255,255,.5), 7px 7px 20px 0px rgba(0,0,0,.1), 4px 4px 5px 0px rgba(0,0,0,.1);
        border-radius: 5px;
        margin: 0;
        text-align: center;
        -webkit-box-sizing: border-box;
        -moz-box-sizing: border-box;
        box-sizing: border-box;
        -webkit-transition: all .3s;
        transition: all .3s;
    }

        .btn-12 span:nth-child(1) {
            box-shadow: -7px -7px 20px 0px #fff9, -4px -4px 5px 0px #fff9, 7px 7px 20px 0px #0002, 4px 4px 5px 0px #0001;
            -webkit-transform: rotateX(90deg);
            -moz-transform: rotateX(90deg);
            transform: rotateX(90deg);
            -webkit-transform-origin: 50% 50% -20px;
            -moz-transform-origin: 50% 50% -20px;
            transform-origin: 50% 50% -20px;
        }

        .btn-12 span:nth-child(2) {
            -webkit-transform: rotateX(0deg);
            -moz-transform: rotateX(0deg);
            transform: rotateX(0deg);
            -webkit-transform-origin: 50% 50% -20px;
            -moz-transform-origin: 50% 50% -20px;
            transform-origin: 50% 50% -20px;
        }

    .btn-12:hover span:nth-child(1) {
        box-shadow: inset 2px 2px 2px 0px rgba(255,255,255,.5), 7px 7px 20px 0px rgba(0,0,0,.1), 4px 4px 5px 0px rgba(0,0,0,.1);
        -webkit-transform: rotateX(0deg);
        -moz-transform: rotateX(0deg);
        transform: rotateX(0deg);
    }

    .btn-12:hover span:nth-child(2) {
        box-shadow: inset 2px 2px 2px 0px rgba(255,255,255,.5), 7px 7px 20px 0px rgba(0,0,0,.1), 4px 4px 5px 0px rgba(0,0,0,.1);
        color: transparent;
        -webkit-transform: rotateX(-90deg);
        -moz-transform: rotateX(-90deg);
        transform: rotateX(-90deg);
    }