rmcg.dev/FrontendMentor/newbie/order-summary-component/css/style.css

@import url("https://fonts.googleapis.com/css2?family=Red+Hat+Display:wght@500;700;900&display=swap");

/* 
    Mobile 375 x 709
    Box roughly: 327 x 567
    Ratio 0.872 x 0.7997179126 
    
    Desktop: 1440 x 900
    Box roughly: 450 x 697
    Ratio 0.3125 x 0.7744444444
*/
:root {
    /* colors */

    --clr-pale-blue: hsl(225, 100%, 94%);
    --clr-bright-blue: hsl(245, 75%, 52%);

    --clr-very-pale-blue: hsl(225, 100%, 98%);
    --clr-desaturated-blue: hsl(224, 23%, 55%);
    --clr-dark-blue: hsl(223, 47%, 23%);

    /* fonts */
    --fs-p: 1rem;
    --fw-500: 500;
    --fw-700: 700;
    --fw-900: 900;

    /* Border Radius */
    --br-11: 11px;
    --br-20: 20px;
}

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

/* General Formating */

body {
    font-family: "Red Hat Display", sans-serif;
    width: 100vw;
    height: 100vh;
    background-color: var(--clr-pale-blue);
}

main {
    background-image: url(../images/pattern-background-mobile.svg);
    background-repeat: no-repeat;
    /* margin: 0 auto; */
    width: 100%;
    height: 100%;

    margin: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.card {
    width: 87.2%;
    border-radius: var(--br-20);
    background-color: white;
    text-align: center;
}
.hero-image img {
    width: 100%;
    border-radius: var(--br-20) var(--br-20) 0 0;
    margin-bottom: 2rem;
}

.card h1 {
    font-weight: var(--fw-900);
    font-size: 1.375rem;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--clr-dark-blue);
}

.card p {
    font-weight: var(--fw-500);
    color: var(--clr-desaturated-blue);
    margin: 0 2rem;
    font-size: 0.9375rem;
    margin-bottom: 1.5rem;
    line-height: 25px;
}

.price-plan {
    display: flex;
    justify-content: space-around;
    align-items: center;

    width: 85%;
    margin: 0 auto 1.5rem auto;
    padding: 1rem 0;

    border-radius: var(--br-11);
    background-color: var(--clr-very-pale-blue);
}

.plan-type {
    color: var(--clr-dark-blue);
    font-size: 0.875rem;
    font-weight: var(--fw-900);
    margin-bottom: 0.1875rem;
}
.plan-price {
    color: var(--clr-desaturated-blue);
    font-size: 0.875rem;
    font-weight: 500;
}
.change-button {
    font-size: 0.8125rem;
    font-weight: var(--fw-700);
    color: var(--clr-bright-blue);
}

.button-area a {
    display: block;
    text-decoration: none;
    font-weight: var(--fw-900);
    font-size: 0.9375rem;
    line-height: 20px;
}
.payment-button {
    color: white;
    /* margin-bottom: 1.5rem; */
    background-color: var(--clr-bright-blue);
    width: 85%;
    margin: 0 auto 1.5rem auto;
    box-shadow: 0px 20px 20px rgba(56, 42, 225, 0.190291);
    border-radius: var(--br-11);
    padding: 15px 0;
}
.cancel-button {
    color: var(--clr-desaturated-blue);
    margin-bottom: 2rem;
}

@media screen and (min-width: 376px) {
    main {
        background-image: url(../images/pattern-background-desktop.svg);
    }
}