style.css

@import url('https://fonts.googleapis.com/css2?family=Courgette&display=swap');

body {
    margin: 0;
    padding: 0;
    background-color: #1f6e0b;
    background-image: url("https://www.transparenttextures.com/patterns/45-degree-fabric-light.png");
    /* This is mostly intended for prototyping; please download the pattern and re-host for production environments. Thank you! */
    font-family: 'Courgette', cursive;
    color:#f5f1f1;
}

button {
    background-color: gold;
    font-family: 'Courgette', cursive;
    font-size: 1.2em;
    padding: 5px 12px;
    border: 0;
    border-radius: 5px;
    box-shadow: 1px 1px 4px hsla(0, 0%, 21%, .5);
}
#player-option-cntnr button:active {
    box-shadow: 1px 1px 20px rgba(243, 239, 6, 0.5);
    transform: scale(0.92, 0.92);
}

/* title */
nav {
    background-color: #9a1919;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='4' height='4' viewBox='0 0 4 4'%3E%3Cpath fill='%23df5416' fill-opacity='0.4' d='M1 3h1v1H1V3zm2-2h1v1H3V1z'%3E%3C/path%3E%3C/svg%3E");
}
#game-title {
    text-align: center;
    font-size: 2.3em;
    margin: 0;
    padding: .5em 0;
}
hr {
    border-top: 5px solid gold;
    box-shadow: 1px 1px 4px hsla(0, 0%, 21%, .5);
}

main {
    display: flex;
}

main > * {
    flex-grow: 2;
}

#display {
    width: 100px;
    height: 10vh;
    min-height: 70px;
    margin-top: 150px;
    border: 2px solid black;
    color: black;
    text-align: center;
    flex-grow: 1;
    order: 2;
    background-color: #f0f0f0;
    background-image: url("https://www.transparenttextures.com/patterns/beige-paper.png");
    /* This is mostly intended for prototyping; please download the pattern and re-host for production environments. Thank you! */
}

#player-div {
    order: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
}
#player-div p {
    font-size: 1.15em;
}
#player-select {
    width: 50%;
    height: 30vh;
    min-height: 250px;
    border: 2px solid black;
    overflow: hidden;
    background-color: #f0f0f0;
    background-image: url("https://www.transparenttextures.com/patterns/beige-paper.png");
    /* This is mostly intended for prototyping; please download the pattern and re-host for production environments. Thank you! */
}

.select-img {
    box-sizing: border-box;
    width: 100%;
    min-width: 200px;
    max-width: 250px;
    display: block;
    margin: auto;
}

#player-option-cntnr {
    display: flex;
    width: 100%;
    justify-content: space-around;
    margin-top: 50px;
}

#vertical-hr {
    position: absolute;
    background-color: gold;
    box-shadow: 1px 1px 4px hsla(0, 0%, 21%, .5);
    z-index: -1;
    width: 10px;
    margin: auto;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
}

#computer-div {
    order: 3;
    display: flex;
    flex-direction: column;
    align-items: center;
}
#computer-div p {
    font-size: 1.15em;
}
#computer-select {
    width: 50%;
    height: 30vh;
    min-height: 250px;
    border: 2px solid black;
    background-color: #f0f0f0;
    background-image: url("https://www.transparenttextures.com/patterns/beige-paper.png");
    /* This is mostly intended for prototyping; please download the pattern and re-host for production environments. Thank you! */
}
#computer-option-cntnr {
    display: flex;
    width: 100%;
    justify-content: space-around;
    margin-top: 50px;
}

.button-select {
    box-shadow: 1px 1px 20px rgba(243, 239, 6, 0.5);
    transform: scale(0.92, 0.92);
}