@media (max-width: 960px) {
    .box {
        background-color: green;
        position: relative;
    }
    .box::before {
        content: "Width: 960px";
        position: absolute;
        top: 90px;
        left: 60px;
    }
}
@media (max-width: 768px) {
    .box {
        background-color: blue;
        position: relative;
    }
    .box::before {
        content: "Width: 768px";
        position: absolute;
        top: 90px;
        left: 60px;
    }
}
@media (max-width: 480px) {
    .box {
        background-color: yellow;
        position: relative;
    }
    .box::before {
        content: "Width: 480px";
        position: absolute;
        top: 90px;
        left: 60px;
    }
}