@mixin is-active {
    .is-active > &,
    .is-active > li > &,
    &.is-active,
    &.is-active:hover { @content; }
}

@mixin is-disabled {
    .is-disabled > &,
    .is-disabled > li > &,
    &.is-disabled,
    &.is-disabled:hover,
    &[disabled],
    &[disabled]:hover { @content; }
}

@mixin is-info {
    &.is-info { @content; }
}

@mixin is-error {
    &.is-error { @content; }
}

@mixin is-warning {
    &.is-warning { @content; }
}

@mixin is-success {
    &.is-success { @content; }
}