.rainbow {
    background-image: -webkit-gradient(
        linear,
        left top,
        left bottom,
        color-stop(0, #f77),
        color-stop(50%, #7f7),
        color-stop(100%, #77f)
    );
}

button.linkb {
    -webkit-appearance: none;
    margin-bottom: -3px;
    border: 0;
    box-shadow: none;
    padding: 0px 2px;
    background: transparent;

    &:disabled {
        opacity: 0.3;
        cursor: not-allowed;
    }

    .nightMode & > img {
        filter: invert(180);
    }
}

button:focus {
    outline: none;
}

button.highlighted {
    #topbutsleft & {
        background-color: lightgrey;

        .nightMode & {
            background: linear-gradient(0deg, #333333 0%, #434343 100%);
        }
    }

    #topbutsright & {
        border-bottom: 3px solid black;
        border-radius: 3px;

        .nightMode & {
            border-bottom-color: white;
        }
    }
}