:root {
    /* Primary */

    --red: hsl(0, 78%, 62%);
    --cyan: hsl(180, 62%, 55%);
    --orange: hsl(34, 97%, 64%);
    --blue: hsl(212, 86%, 64%);

    /* Neutral */

    --very-dark-blue: hsl(234, 12%, 34%);
    --grayish-blue: hsl(229, 6%, 66%);
    --very-light-gray: hsl(0, 0%, 98%);
}

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

html {
    font-size: 62.5%;
    font-family: 'Poppins', sans-serif;
}

body {
    width: auto;
    height: auto;
    background-color: hsl(0, 0%, 95%);
}

main {
    width: 100%;
    margin: 0 auto;
    max-width: 425px;
    padding: 5rem 0 3.5rem;
    background-color: white;
}

.title-box {
    width: 90%;
    margin: 0 auto 5rem;
    text-align: center;
    color: var(--very-dark-blue);
}

.title {
    width: 100%;
    font-size: 2.7rem;
    font-weight: 200;
}

.title-box h1 {
    width: 100%;
    font-size: 2.7rem;
    font-weight: 600;
    margin-bottom: 2rem;
}

.title-box h1 + p {
    width: 100%;
    margin: 0 auto;
    font-size: 1.7rem;
    font-weight: 400;
    line-height: 3rem;
    color: var(--grayish-blue);
}

.cards-box, .center-cards {
    width: 100%;
}

.card {
    width: 80%;
    margin: 0 auto 3rem;
    height: 25rem;
    border-radius: 0.8rem;
    display: flex;
    flex-direction: column;
    box-shadow: 0px 10px 20px 4px var(--grayish-blue);
}

.card h2 {
    width: 85%;
    margin: 3rem auto 1rem;
    font-size: 2.2rem;
    color: var(--very-dark-blue);
}

.card p {
    width: 85%;
    margin: 0 auto;
    font-size: 1.5rem;
    color: var(--grayish-blue);
}

.card img {
    width: 6.4rem;
    align-self: flex-end;
    margin-top: 2.5rem;
    margin-right: 3rem;
}

.one {
    border-top: solid 0.5rem var(--cyan);
}

.two {
    border-top: solid 0.5rem var(--red);
}

.three {
    border-top: solid 0.5rem var(--orange);
}

.four {
    border-top: solid 0.5rem var(--blue);
}

footer {
    width: 100%;
    margin: 0 auto;
    max-width: 425px;
    padding-bottom: 2rem;
    background-color: white;
    font-size: 1.1rem; 
    text-align: center; 
}

footer a { 
    color: hsl(228, 45%, 44%); 
}

@media only screen and (min-width: 425px) {
    .title-box h1 + p {
        width: 90%;
    }
}

@media only screen and (min-width: 1440px) {
    body {
        background-color: white;
    }
    
    main {
        max-width: 1300px;
    }

    .title {
        font-size: 4rem;
    }

    .title-box h1 {
        font-size: 4rem;
    }

    .title-box h1 + p {
        width: 45%;
    }

    .cards-box {
        display: flex;
        align-items: center;
    }

    .card {
        height: 30rem;
    }

    .card h2 {
        font-size: 3rem;
    }

    .card p {
        font-size: 1.8rem;
    }

    .card img {
        margin-top: 4rem;
    }
}