html,
body {
    margin: 0;
    background-color: #1e1e1e;
    font-family: 'Roboto', sans-serif;
}

input[type='range'] {
    -webkit-appearance: none;
    appearance: none;
    background: #dcdcdc;
    height: 2px;
    outline-color: #ed143d;
}

input[type='range']::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 5px;
    height: 15px;
    background: #dcdcdc;
    border-radius: 2px;
    cursor: pointer;
}

input[type='range']::-moz-range-thumb {
    appearance: none;
    width: 5px;
    height: 15px;
    background: #dcdcdc;
    border-radius: 2px;
    cursor: pointer;
}

button {
    background: transparent;
    border: solid 1px #dcdcdc;
    font-weight: bold;
    outline: none;
    color: #dcdcdc;
    padding: 5px;
    width: 130px;
    cursor: pointer;
    transition: background 0.1s;
}

h4 {
    color: #ed143d;
}

button:hover {
    background: rgba(255, 255, 255, 0.1);
}