.mid-box {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 70px;
    background-color: #f1f1f1;
    color: #333;
}
.mid-box:hover {
    background-color: #333;
    color: #f1f1f1;
}

/* Small devices (tablets, 768px and up) */

@media (min-width: 576px) {}

/* Medium devices (tablets, 768px and up) */

@media (min-width: 768px) {}

/* Large devices (desktops, 992px and up) */

@media (min-width: 992px) {}

/* Extra large devices (large desktops, 1200px and up) */

@media (min-width: 1200px) {}

/*  extra devices (large desktops, 1600px and up) */

@media (min-width: 1600px) {}