toggleBtn.css

@media (max-width: 750px) {

    .sidebar > .icon-space {
        position: relative;
    }

    .sidebar > .icon-space:before {
        content: "";
        width: 90%;
        height: 2px;
        background-color: white;
        transform: translateY(-8px);
        -webkit-transform: translateY(-8px);
        box-shadow: 0px 8px 0px white,
        1px 1px 1px rgba(0, 0, 0, 0.8),
        1px 9px 1px rgba(0, 0, 0, 0.8);
        position: absolute;
        transition: all var(--animationTime);
        -webkit-transition: all var(--animationTime);
    }

    .sidebar > .icon-space:after {
        content: "";
        width: 90%;
        height: 2px;
        background-color: white;
        transform: translateY(8px);
        -webkit-transform: translateY(8px);
        box-shadow: 1px 1px 1px rgba(0, 0, 0, 0.8);
        position: absolute;
        transition: all var(--animationTime);
        -webkit-transition: all var(--animationTime);
    }

    .sidebar.open > .icon-space:before {
        transform: rotateZ(-45deg);
        -webkit-transform: rotateZ(-45deg);
        box-shadow: none;
    }

    .sidebar.open > .icon-space:after {
        transform: rotateZ(45deg);
        -webkit-transform: rotateZ(45deg);
        box-shadow: none;
    }

}