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-wrapper {
    position: relative;
}

#operations-dropdown {
    position: absolute;
    top: 40px; /* the height of the input[type="search"] with pos relative */
    width: 100%;
    height: auto;
    max-height: 60vh;
    overflow: auto;
    z-index: 20; /* to dropdown on top of all the other elements */
    border-bottom: 1px solid var(--primary-border-colour);
}

#reset-operations.hidden,
#search-results.hidden,
#categories.hidden {
    z-index: -10;
    display: none;
}

@media only screen and ( min-width: 768px ){
    #operations-dropdown {
        border-bottom: none;
    }

    #search-results.hidden,
    #categories.hidden {
        z-index: initial;
        display: block;
    }
}