.res-customer-items {
    display: flex;
    margin: 20px auto;
    flex-wrap: wrap;
}

.res-customer-item {
    width: 70px;
    margin: auto;
}

    .res-customer-item > img {
        width: 100%;
    }

.res-customer-hover {
    display: none;
}

/* *************** */

@media screen and (min-width: 375px) {
    .res-customer-item {
        width: 80px;
    }
}

@media screen and (min-width: 480px) {
    .res-customer-item {
        width: 90px;
    }
}

@media screen and (min-width: 600px) {
    .res-customer-item {
        width: 100px;
    }
}

@media screen and (min-width: 768px) {
    .res-customer-item {
        width: 110px;
    }
}

@media screen and (min-width: 992px) {
    .res-customer-item {
        width: 120px;
    }

    .res-customer-item:hover .res-customer-icon {
        display: none;
    }

    .res-customer-item:hover .res-customer-hover {
        display: block;
    }
}

@media screen and (min-width: 1200px) {
    .res-customer-item {
        width: 120px;
    }
}