style.css

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-size: 32px;
    font-family: 'Courier New', Courier, monospace, sans-serif;
}
:root{
    --blur:10px;
    --space:10px;
    --color:rgb(248, 123, 6);
}
body {
    padding: 30px;
    background-color: rgb(53, 53, 53);
    color: white;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;

}

/* header style  */
header {
    margin-bottom: 20px;
}

header h1 {
    font-size: 1.5rem;
}

header h1 span {
    font-size: 1.5rem;
    color: var(--color);
}

/* main style  */
main {
    background-color: rgb(37, 37, 37);
    padding: 30px;
    border-radius: 10px;
    width: 70vw;
    display: flex;
    flex-direction: column;
    box-shadow: 0px 0px calc(40px + var(--space)) var(--color);

}

.controles div {
    display: flex;
    justify-content: space-around;
    width: 100%;
}

.controles div input {
    flex-grow: 1;
}

.controles div label {
    flex-grow: 1;
    width: 600px;
}

.controles div input#SColor {
    flex-grow: 0;
    height: 30px;
    border: none;
    border-radius: 10px;
}

.myIdImg {
    margin-top: 50px;
    display: flex;
    justify-content: center;

}

.myIdImg img {
    width: 100%;
    border-style: solid;
}

/* applique style control  */

#myImg {
    filter: blur(var(--blur));
    border-color: var(--color);
    border-width:var(--space);
}

@media (max-width:870px) {
    header h1 {
        font-size: 1.2rem;
    }

    header h1 span {
        font-size: 1.2rem;

    }

    main {
        width: 90vw;

    }

    .controles div {
        flex-direction: column;
    }
}

@media (max-width:710px) {
    header h1 {
        font-size: 0.8rem;
    }

    header h1 span {
        font-size: 0.8rem;
    }
}

@media (max-width:490px) {
    header h1 {
        font-size: 0.5rem;
    }

    header h1 span {
        font-size: 0.5rem;
    }
}