.o-mail-MessageCardList {
    .card {
        --border-opacity: .075;
    }

    .card-body {
        background-color: var(--mail-MessageCardList-cardBodyBg, $o-view-background-color);
    
        &:hover .o-mail-MessageCard-jump {
            opacity: 100 !important;
        }
    }
}

.o-mail-MessageCard-jump {
    color: white;
}

.o_touch_device .o-mail-MessageCard-jump.btn {
    font-size: 0.9rem;
}