style.css

html, body {
    margin: 0;
    padding: 0;
    font-family: Verdana, Arial, Helvetica, sans-serif;
    font-size: 16px;
    line-height: 1;
    background-color: #EEEEEE;
}
a{
    color: black;
}
img {
    width: 100%;
}
h1 {
    color: #B10021;
    margin: 20px auto;
    width: 146px;
}
.mobile {
    display: none;
}
.nav-bar {
    background-color: #B10021;
    height: 45px;
    padding: 4px 0px;
}
.nav-bar ul {
    padding: 0;
}
.nav-bar ul li {
    list-style: none;
    width: 19%;
    text-align: center;
    color: #fff;
    padding-top: 8px;
    padding-bottom: 8px;
    margin-top: -8px;
    border-radius: 6px;
    display: inline-block; 
}
.nav-mobile {
    display: none;
}
.row_1, .row_2, .row_3 {
    display: inline;
}
.img-box {
    width: 24%;
    margin: 10px 3%;
    background-color: #fff;
    padding: 1%;
    display: inline-block;
    position: relative;
}
.img-box h3 {
    font-weight: normal;
    color: #B10021;
    text-align: center;
}
.cover {
    text-align: center;
    position: absolute;
    background-color: #B10021;
    opacity: 0.9;
    display: none;
    width: 100%;
    height: 100%;
    top: 0; 
    left: 0; 
    transition: all 50ms ease-in-out;
}
.cover i {
    padding: 1%;
    background-color: #ffffff;
    border-radius: 4px;
    margin-top: 37%;
}
footer {
    margin: 0 auto;
    width: 325px;
}
@media screen and (min-width: 1000px) {
    .img-box {
        width: 11.5%;
    }
    .row_1, .row_2, .row_3 {
        display: block;
        text-align: center;
    }
    .img-box h3 {
        font-size: 15px;
    }
    .cover i {
        margin-top: 48%;
    }
}
@media screen and (max-width:1000px) {
    .nav-bar:hover {
        cursor: pointer;
    }
    .mobile-nav {
        background-color: #2A2A2A;
        display: none;
        margin: 0;
        padding: 0;
    }
    .mobile-nav li {
        display: block;
        text-align: center;
        border-bottom: 1px solid #444444;
        border-radius: initial;
        width: 100%;
        line-height: 3em;
        color: #fff;
    }
    .mobile {
        display: block;
        text-align: center;
        font-size: 1.5em;
        color: #fff;
    }
    .mobile i {
        line-height: 1.75em;
    }
    .img-box {
        width: 41.5%;
    }
    .cover i {
        margin-top: 41%;
    }
}
@media screen and (max-width:767px) {
    .img-box {
        width: 92%;
    }
    .cover i {
        margin-top: 38%;
    }
}