CyberChef/src/web/stylesheets/components/operations/_operations.css

/**
 * Operations component styles
 *
 * For consistency sake I'm using an ID, but the custom wrapper / dropdown component
 * can ( should ) be made into a reusable, generic component
 */

#operations {
    background-color: var(--primary-background-colour);
}

#operations > .title {
    padding: 8px 8px 8px 12px;
}

#operations-wrapper {
    position: relative;
}

#operations-dropdown {
    position: absolute;
    top: calc(var(--banner-height) + 1);
    width: 100%;
    height: auto;
    overflow: auto;
    z-index: 20; /* to dropdown on top of all the other elements */
    background-color: var(--secondary-background-colour);
}

/* 'hidden' is used to handle the visibility of a variety of mobile only elements */
#close-ops-dropdown-icon.hidden,
#search-results.hidden,
#categories.hidden {
    z-index: -10;
    display: none;
}

@media only screen and ( min-width: 1024px ){
    #operations-dropdown {
        border-bottom: none;
    }

    /* On desktop UI, the categories are always visible */
    /*#search-results.hidden,*/
    #categories.hidden {
        z-index: initial;
        display: block;
    }
}