rmcg.dev/FrontendMentor/newbie/four-card-feature-section/css/style.css

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@200;400;600&display=swap');

/* 
 * Challenge colors, font
 * 
 * The font-size for 20px is to make rem clearer for increments
 *
 * Mobile: 375px (375x1360)
 * Desktop: 1440px (1440x922)
*/

:root {
    font-family: 'Poppins', sans-serif;
    font-size: 20px;

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

    /* Neutral */
    --veryDarkBlue: hsl(234, 12%, 34%);
    --grayishBlue: hsl(229, 6%, 66%);
    --veryLightGray: hsl(0, 0%, 98%);
}

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

/* Basic Styling */

body {
    font-size: 15px;
    background-color: var(--veryLightGray);
    height: 100vh;
}

.flexContainer {
    display: flex;
    flex-direction: column;
    width: 83.5%;
    /* height: 100vh; */
    margin: 0 auto;
    max-width: 400px;
}

.topSection {
    /* think this change was brought about by browser differences. Was previously 3.8 */
    margin-top: 3.65rem;
    text-align: center;
}

.topSection > .title {
    font-size: calc(24px + (35 - 24) * ((100vw - 375px) / (1440 - 375)));
}

.topSection .title1 {
    margin-top: 0.5rem;
    font-weight: 200;
    color: var(--grayishBlue);
}

/* should be a class but wanted to play with :nth-child() */
.topSection .title2 {
    font-weight: 600;
    color: var(--veryDarkBlue);
}

.topSection .blurb {
    margin-top: 0.7rem;
    text-align: center;
    color: var(--grayishBlue);
    font-size: 16px;
}


.middleSection {
    margin-top: 2.5rem;
}

.card {
    margin-top: 1.3rem;
    background-color: white;
    border-top: 4px solid;
    border-radius: 6px;
    box-shadow: 0px 10px 15px rgba(56, 75, 108, 0.2);
    padding: 23px 30px 26px 30px;
}
.card-title {
    font-size: 20px;
    color: var(--veryDarkBlue);
    font-weight: 600;
}
.card-blurb {
    margin-top: 0.3rem;
    color: var(--grayishBlue);
    font-size: 13px;
}
.card-image {
    display: block;
    margin-top: 1.8rem;
    margin-left: auto;
    width: 22%;

}

.column1 {
}
.supervisor {
    border-top-color: var(--cyan);
}
.column2 {
}
.teamBuilder {
    border-top-color: var(--red);
}
.karma {
    border-top-color: var(--orange);
}
.column3 {
}
.calculator {
    border-top-color: var(--blue);
}
/* .attribution {
} */

/* arbitrary figure atm */
/* @media screen and (min-width: 600px) {
    .flexContainer {
        width: 78%;
    }
} */

@media screen and (min-width: 1000px) {

    .flexContainer {
        max-width: 1440px;
    }

    .topSection {
        margin-top: 3.45rem;
    }

    .topSection .blurb {
        width: 45%;
        margin-left: auto;
        margin-right: auto;
        font-size: 15px;
    }
    
    .flexContainer {
        width: 78%;
    }
    .middleSection {
        margin-top: 3.3rem;
        display: flex;
    }

    .card {
        margin-top: 0;
        padding: 27px 30px 36px 25px;
    }

    .card-blurb {
        margin-top: 0.5rem;
    }
    .card-image {
        margin-top: 2rem;
    }
    
    .column {
        display: flex;
        flex-direction: column;
        margin: auto;
        max-width: calc((100% /3) - 1.5rem);
    }

    .karma {
        margin-top: 1.3rem;
    }
}