.single-line-alert {
    .v-alert__close,
    .v-alert__prepend {
        align-self: center !important;
    }
}

@media (max-width: 500px) {
    .single-line-alert {
        display: flex;
        flex-wrap: wrap;
       
        .v-alert__append {
            margin-inline-start: 0px;
        }
        .v-alert__close {
            margin-left: auto;
        }
        .v-alert__content {
            width: 100%;
            margin-top: 5px;
        }
    }
}