ns-serif;
        }

        /* The style for SQL NULL */
        .null {
            color: var(--null-color);
        }

        @keyframes hourglass-animation {
            0% {
                transform: rotate(-180deg);
            }
            50% {
                transform: rotate(-180deg);
            }
            100% {
                transform: none;
            }
        }

        #hourglass {
            display: none;
            margin-left: 1rem;
            font-size: 110%;
            