* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}

html {
    font-size: 62.5%;
}

.container {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #f5f7fb;
}

.color_changer {
    width: 90%;
    max-width: 50rem;
    padding: 2rem 0;
    border-radius: 1.6rem;
    text-align: center;
    background-color: white;
}

.color_changer > *:not(:last-child) {
    margin-bottom: 2rem;
}

.color_changer h1 {
    background-color: #f5f7fb;
    width: fit-content;
    margin: auto;
    padding: 1rem 2rem;
    border-radius: 1rem;
    font-size: 2.5rem;
}

.color_changer button {
    background-color: #2563eb;
    color: white;
    border: none;
    font-size: 1.6rem;
    padding: .7rem 3rem;
    border-radius: 1.2rem;
}