argon-dashboard-react/src/assets/scss/argon-dashboard/custom/alerts/_alert-dismissible.scss

//
// Dismissible alert
//

.alert-dismissible {
    .close {
        top: 50%;
        right: $alert-padding-x;
        padding: 0;
        transform: translateY(-50%);
        color: rgba($white, .6);
        opacity: 1;

        &:hover,
        &:focus {
            color: rgba($white, .9);
            opacity: 1 !important;
        }

        @include media-breakpoint-down(xs) {
            top: 1rem;
            right: .5rem;
        }

        &>span:not(.sr-only) {
            font-size: 1.5rem;
            background-color: transparent;
            color: rgba($white, .6);
        }

        &:hover,
        &:focus {
            &>span:not(.sr-only) {
                background-color: transparent;
                color: rgba($white, .9);
            }
        }
    }
}