style.css

*, ::before, ::after {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

body {
    height: 100vh;
    background: linear-gradient(120deg, #FFD143FF, #FF9153FF);
    font-size: 12px;
    font-family: Montserrat, sans-serif;
}

.toast_copy {
    display: none;
    position: absolute;
    background: #ffffff;
    width: 400px;
    left: 50%;
    top: 2%;
    transform: translateX(-50%);
    padding: 20px;
    border-radius: 5px;
    box-shadow: 10px 10px 14px 1px rgb(0 0 0 / 20%);
    font-size: 1.3em;
    text-align: center;
    opacity: 0;
    transition: opacity 0.2s ease-in;
}

.container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.input_group {
    outline: 2px solid #fff;
    box-shadow: 10px 10px 14px 1px rgb(0 0 0 / 20%);
    margin: 30px auto;
    border-radius: 999px;
    text-align: center;
    width: 350px;
    display: flex;
    position: relative;
}

.input_group label {
    display: block;
    width: 100%;
    height: 100%;
    cursor: pointer;
    padding: 20px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 1.5em;
}

.input_group:first-child {
    background: #FFD143FF;
}

.input_group:nth-child(2) {
    background: #FF9153FF;
}

input[type="color"] {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    visibility: hidden;
}

.range_group label {
    background: #ffffff;
    border-radius: 5px;
    padding: 15px;
    font-size: 1.2em;
    font-weight: 600;
    display: block;
    box-shadow: 10px 10px 14px 1px rgb(0 0 0 / 20%);
    text-align: center;
    width: 200px;
    margin: 30px auto;
}

.range_group .range_gradient {
    width: 100%;
}

.button_group {
    margin: 30px auto;
    display: flex;
    justify-content: center;
}

.button_group button {
    padding: 20px;
    margin: auto 10px;
    border: none;
    border-radius: 999px;
    width: 150px;
    background: #fff;
    box-shadow: 10px 10px 14px 1px rgb(0 0 0 / 20%);
    font-size: 1.3em;
    font-weight: 900;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.button_group button:hover {
    transform: translateY(-5px);
}