index.css

* {
    box-sizing: border-box;
}

html {
    font-size: 16px;
}

html,
body {
    padding: 0;
    margin: 0;
}

body {
    background-color: f6f6f6;
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    font-weight: 400;
    line-height: 20px;
}

a:visited {
    user-select: none;
    outline: none;
    box-shadow: none;
}

.container {
    display: flex;
    flex-direction: column;
    margin: 0 auto;
    width: 100%;
    max-width: 650px;
    position: relative;
    -webkit-box-shadow: 0px 2px 6px -2px whitesmoke;
    -moz-box-shadow: 0px 2px 6px -2px whitesmoke;
    box-shadow: 0px 2px 6px -2px whitesmoke;
}

/* header section */

.header-container {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    margin: 0 auto;
    width: 100%;
    max-width: 650px;
    position: relative;
    padding: 0 3em;
}

header {
    display: flex;
    height: 236px;
    background-color: #0E0E0E;
    background-image: url("./img/header-background.png");
    width: 100%;
    background-repeat: no-repeat;
    background-size: cover;
    color: #FFF;
}

header h1 {
    margin: 0;
    font-size: 2.7rem;
    font-weight: 800;
    letter-spacing: -0.045em;
}

header a {
    cursor: pointer;
    text-decoration: none;
    color: #FFF;
    font-weight: 700;
    font-size: 0.9rem;
    border: 1px solid whitesmoke;
    border-radius: 4px;
    padding: 0.4em 0.8em;
    background-color: #363636;
}

header a:hover {
    background-color: #303030;
}

/* search block elements */

.search-block {
    display: flex;
    box-shadow: 0px 1px 2px rgba(0, 0, 0, 0.05);
    width: 90%;
    align-self: center;
    position: absolute;
    top: 135px;
    right: 5%;
    z-index: 1;
}

input[type="text"] {
    appearance: none;
    width: 70%;
    border: 1px solid #D1D5DB;
    padding: 0.8em;
    border-radius: 6px 0 0 6px;
}

input[type="text"]:focus {
    outline: none;
}

.search-btn {
    width: 30%;
    min-width: 55px;
    background: #F9FAFB;
    appearance: none;
    border: 1px solid #D1D5DB;
    border-left: none;
    border-radius: 0 6px 6px 0;
    cursor: pointer;
    transition: all 0.2s;
}

.search-btn:hover,
.search-btn:active {
    background-color: #d4dcf2;
}


.search-btn:focus {
    background-color: none;
}

/* main content section */

main {
    background-color: #FFF;
    min-height: 80vh;
    width: 100%;
    margin: 0 auto;
}

.placeholder-block {
    color: #DFDDDD;
    display: flex;
    flex-direction: column;
    height: 65vh;
    text-align: center;
    justify-content: center;
}

.placeholder-block>img {
    max-width: 70px;
    align-self: center;
}

.placeholder-block>p {
    font-size: 1.3rem;
}

.link-to-index {
    display: flex;
    justify-content: center;
    align-items: center;
    text-decoration: none;
    color: #363636;
    font-weight: 700;
    font-size: 0.8rem;
    max-width: max-content;
    margin: 0 auto;
}

.link-to-index>img {
    min-width: 1rem;
    margin-right: 1em;
    max-height: 1rem;
}

/* content added via API */
.movie-container {
    width: 100%;
}

.movie-block {
    display: flex;
    width: 100%;
    justify-content: flex-start;
    align-items: center;
    border-bottom: 1px solid #E5E7EB;
    color: #111827;
}

.movie-block:last-child {
    border-bottom: none;
}

.movie-img {
    margin: 0.5em 2em 1em 0;
    background-color: #F6F6F6;
    background-size: cover;
    background-repeat: no-repeat;
}

.movie-name-line {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

h2.movie-name {
    margin: 0;
    font-weight: 500;
    font-size: 1.1rem;
    padding-right: 1em;
}

.rating {
    display: flex;
    align-items: center;
    font-weight: 400;
    font-size: 0.8rem;
}

.rating>img {
    width: 0.7rem;
    height: 0.7rem;
    margin: 0 0.45em 0.08em 0;
}

.movie-data-line {
    display: flex;
    align-items: center;
    font-size: 0.8rem;
}

.movie-length,
.movie-genres,
.add-to-watchlist {
    padding: 0 1em 0 0;
}

.add-to-watchlist {
    display: flex;
    align-items: center;
    margin-left: auto;
    padding-left: 2em;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
}

.add-to-watchlist:focus,
.add-to-watchlist:hover {
    color: #6B7280;
}

.add-to-watchlist:active {
    color: #d4dcf2;
}

.add-to-watchlist>img {
    width: 0.7rem;
    margin: 0.3em;
}

.movie-description {
    font-size: 0.875rem;
    color: #6B7280;
}

/* media queries */
@media (min-width: 0px) {

    html,
    body {
        font-size: 0.9rem;
        margin: 0 auto;
        min-width: 315px;
    }

    .header-container {
        flex-direction: column;
        align-items: center;
    }

    header {
        align-items: center;
    }


    header a {
        margin-top: 2em;
    }

    .movie-block:nth-child(1) {
        margin-top: 1em;
    }

    .movie-block {
        padding: 1em;
    }

    .movie-img {
        width: calc(9rem / 1.5);
        min-width: calc(9rem / 1.5);
        height: 9rem;
    }
}

@media (min-width: 450px) {

    html,
    body {
        font-size: 1rem;
    }

    main {
        padding: 2em 2em;
    }

    .header-container {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        padding: 0 2em;
    }

    header h1 {
        margin: 0;
    }

    header a {
        margin-top: 6px;
    }

    .search-block {
        top: 118px;
    }

    .movie-container {
        width: 100%;
    }

    .movie-block {
        padding: 1em;
    }

    .movie-name-line {
        margin-bottom: 0.5em;
    }

    .movie-img {
        width: calc(14rem / 1.5);
        min-width: calc(14rem / 1.5);
        height: 14rem;
    }
}

@media (min-width: 690px) {
    .container {
        max-width: 850px;
    }

    body {
        font-size: 1.5rem;
        line-height: 1.5rem;
    }

    .movie-container {
        width: 100%;
    }

    .movie-img {
        width: calc(18rem / 1.5);
        min-width: calc(18rem / 1.5);
        height: 18rem;
    }

    .movie-block:nth-child(1) {
        margin-top: 0;
    }

    .movie-name-line {
        margin-bottom: 0.5em;
    }

    h2.movie-name {
        font-size: 1.4rem;
    }

    .movie-description {
        letter-spacing: 0.5px;
    }
}