.box{
    display: inline-block;
    height: 150px;
    width: 150px;
    background-color: blue;
    border: solid 5px red;
}
.one{
    background-size: cover;
    background-image: url(../img/bgimage1.jpg);
}

.two{
    background-size: cover;
    background-image: url(../img/bgimage-2.jpg);
}

.three{
    background-size: cover;
    background-image: url(../img/bgimage-3.jpg);
}

.four{
    background-size: cover;
    background-image: url(../img/bgimage-4.jpg);
}