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.hamburger {
        position: relative;
    display: inline-block;
    width: 20px;
    height: 10px;
    margin: 0 0;
    border-top: 2px solid $white;
    border-bottom: 2px solid $white; 
    &:before {
      content: "";
    position: absolute;
    top: 4px;
    left: 0px;
    width: 100%;
    border-top: 2px solid $white;
}
}

<span class="hamburger"></span>