Inset shadow with no sides

.inset-shadow {
    position: relative;
    overflow: hidden;
    &:before {
        content: "";
        position: absolute;
        top: 0;
        left: -30px;
        bottom: 0;
        right: -30px;
        .box-shadow(inset 0 10px 23px rgba(0,0,0,0.75));
        z-index: 0;
    }
    > * {
        position: relative;
        z-index: 1010;
    }
}