:root {
  --primary: #333;
  --secondary: #ecebeb;
  --tertiary: #ddd;
  --quaternary: #ccc;
  --quinary: #555;
}

body {
  font-family: 'Arial', sans-serif;
  background-color: var(--secondary);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

.header {
  text-align: center;
  background-color: var(--primary);
  color: #fff;
  padding: 20px;
  border-radius: 10px;
  margin-bottom: 20px;
  width: 90%;
  max-width: 400px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.header h1 {
  margin: 0;
  font-size: 24px;
  font-weight: bold;
}

.header p {
  margin: 5px 0 0;
  font-size: 14px;
  font-style: italic;
  color: var(--quaternary);
}

.container {
  width: 90%;
  max-width: 400px;
  text-align: center;
  background: #fff;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.color-box {
  width: 100%;
  height: 150px;
  margin-bottom: 20px;
  background-color: rgb(0, 0, 0);
  border-radius: 10px;
}

.sliders {
  margin-bottom: 20px;
}

.slider {
  margin: 10px 0;
}

.slider label {
  display: block;
  margin-bottom: 5px;
  font-weight: bold;
}

input[type="range"] {
  width: 100%;
  appearance: none;
  height: 8px;
  background: var(--quaternary);
  border-radius: 5px;
  outline: none;
  -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
  width: 15px;
  height: 15px;
  background: var(--primary);
  border-radius: 50%;
  cursor: pointer;
  -webkit-appearance: none;
}

.rgb-output {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

#rgbValue {
  flex: 1;
  padding: 10px;
  border: 1px solid var(--tertiary);
  border-radius: 5px;
  margin-right: 10px;
  font-size: 16px;
  text-align: center;
}

#copyButton {
  padding: 10px 20px;
  background-color: var(--primary);
  color: #fff;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 16px;
}

#copyButton:hover {
  background-color: var(--quinary);
}