.content-box {
    background-image: url("https://i.ibb.co/X4gHCRN/ultramanbeam.png");
    font-size: 20px;
    padding: 10px;
    border: 1px solid lightgray;
    max-width: 225px;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .content-box {
        font-size: 25px;
        padding: 15px;
        max-width: 100%;
    }
}

.text-bg {
    background: LightCoral;
    padding: 10px;
}