body {
    background-color: RGB(20, 74, 128);
}

.prog {
    position: relative;
    width: 300px;
    border: 1px double white;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    margin-bottom: 5px;
}

.bar {
    height: 30px;
    text-align: center;
    color: #fff;
}

.bar_r {
    width: 7.84%;
    background-color: RGB(20, 0, 0);
}

.bar_g {
    width: 27.84%;
    background-color: RGB(0, 74, 0);
}

.bar_b {
    width: 50.1%;
    background-color: RGB(0, 0, 128);
}

.rng {
    -webkit-appearance: none;
    margin: 10px 0;
    width: 100%;
    outline: none;
}

.rng::-webkit-slider-runnable-track {
    width: 100%;
    height: 12.8px;
    background: RGB(214, 228, 198);
    border-radius: 25px;
}

.rng::-webkit-slider-thumb {
    height: 20px;
    width: 30px;
    border-radius: 50%;
    background: #c0a54b;
    -webkit-appearance: none;
    margin-top: -3.6px;
}
#rng_r::-webkit-slider-thumb {
    background: #ff0000;
}
#rng_g::-webkit-slider-thumb {
    background: #00ff00;
}
#rng_b::-webkit-slider-thumb {
    background: #0000ff;
}

p {
    position: relative;
    background: white;
    text-align: center;
    width: 150px;
    left: 50%;
    transform: translateX(-50%);
}

.btn {
    width: 300px;
    height: 50px;
    position: relative;

    left: 50%;
    font-size: 1.3em;
    outline: none;
    transform: translateX(-50%);
    margin: 20px auto;
}

h1,h5 {
    position:relative;
    text-align:center;
    left:50%;
    transform: translateX(-50%);
}
h5{
    color:aqua
}
header{
    background-color: #d1317b;
}