styles.css

:root {
    --blue: rgba(16, 68, 255, 0.9);
    --yellow: rgba(255, 249, 132, 0.9);
    --red: rgba(255, 41, 41, 0.9);
    --light-grey: hsl(222, 15%, 92%);
    --darker-grey: hsl(222, 15%, 72%);
    --shadow: rgba(0,0,0,0.22);
}

body, html {
    background: linear-gradient(133deg, var(--light-grey) 0%, var(--darker-grey) 100%);
    margin: 0;
    height: 100%;
    font-family: Arial, Helvetica, sans-serif;
}
.custom-range-slider-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    padding: 20px;
}

.custom-range-slider-decale {
    width: 260px;
    height: 260px;
    padding: 60px 0;
}

.custom-range-slider {
    -webkit-appearance: none; 
    width: min(600px, 100%);
    border-radius: 22px;
    background: linear-gradient(90deg, var(--blue) 0%, var(--yellow) 50%, var(--red) 100%);
    box-shadow: 
    inset 4px 0 6px 2px var(--shadow),
    0 0 0 2px var(--darker-grey),
    0 0 0 6px var(--light-grey),
    0 0 12px 14px #dfe2ea;
}
  
.custom-range-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
}
  
.custom-range-slider:focus {
    outline: none;
}

/* Styling the range "Thumb" */
.custom-range-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 30px;
    width: 68px;
    border-radius: 16px;
    background: white;
    cursor: pointer;
    margin-top: 1px;
    box-shadow: 
        4px 0 6px 2px var(--shadow),
        inset 0px 22px 25px 0 white,
        inset 5px 0 5px var(--yellow),
        inset -5px 0 15px var(--red);
    transition: scale 0.1s ease-out;  
}

.custom-range-slider::-webkit-slider-thumb:active {
    scale: 0.9;
    box-shadow: 
        2px 0 4px 2px var(--shadow),
        inset 0px 22px 25px 0 white,
        inset 5px 0 5px var(--yellow),
        inset -5px 0 15px var(--red);
}

.footer {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: center;
    font-size: 0.8em;
    padding: 6px 20px;
    background-color: white;
    box-sizing: border-box;
}

.bounce {
    animation: bounce 0.7s forwards;
}

@keyframes bounce {
    from, to { transform: scale(1, 1); }
    25% { transform: scale(0.9, 1.1); }
    50% { transform: scale(1.1, 0.9); }
    75% { transform: scale(0.95, 1.05); }
}