styles.css

body {
    margin: 0;
    padding: 0;
    position: relative;
    box-sizing: border-box;

    overflow: hidden;
}

.screen {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;

    z-index: 150;

    background-color: #867575;
    color: #bbb89b;

    display: flex;
    justify-content: center;
    align-items: center;

    transition: opacity 0.5s ease-in-out;
}

#lock {
    position: absolute;

    top: 0;
    left: 0;

    display: none;
    background-image: url("images/scope.svg");

    z-index: 100000;
}

#UI {
    position: absolute;

    top: 0;
    left: 0;

    width: 100%;
    height: 100%;
    color: #bbb89b;

    z-index: 100;

    transition: left 0.5s ease-in-out,
                top 0.5s ease-in-out,
                transform 0.5s ease-in-out;
}

#fps {
    position: absolute;

    top: 0;
    left: 0;
}

#pause_controls {
    background-color: rgba(0, 0, 0, 0.75);

    position: absolute;
    display: none;

    top: 50%;
    left: 50%;

    padding: 20px;

    transform: translate(-50%, -50%);
}

.speedometer {
    position: absolute;

    bottom: 10%;
    left: 0;

    background-color: rgba(255, 255, 255, 0.1);
}

.target-speedometer {
    position: absolute;
    color: #bbb89b;

    top: 0;
    left: 100%;

    background-color: rgba(255, 255, 255, 0.1);
}

.group {
    display: flex;
}

.group > h1 {
    font-size: 1rem;
    align-self: center;
    padding: 5px;
    width: 20ch;
    margin: 0;
}

.group > p {
    width: 100px;

    background-color: #4d4d4d;
    color: white;
    padding: 5px 0 5px;
    margin: 0;
}

.group_x:before {
    content: "X";

    background-color: darkred;
    color: white;
    padding: 5px;
    margin-right: 10px;
}

.group_y:before {
    content: "Y";

    background-color: green;
    color: white;
    padding: 5px;
    margin-right: 10px;
}

.group_z:before {
    content: "Z";

    background-color: blue;
    color: white;
    padding: 5px;
    margin-right: 10px;
}

#health {
    position: absolute;

    top: 3%;
    left: 50%;

    transform: translateX(-50%);

    width: 50vw;
    height: 20px;

    border: 3px solid rgba(255, 255, 255, 0.5);

    transition: opacity 0.5s ease-in-out;
}

.target-health {
    position: absolute;

    top: 0;
    left: 0;
    transform: translateY(-100%);

    width: calc(100% - 4px);
    height: 5px;

    border: 2px solid rgba(255, 0, 0, 0.5);
}

#targetHealthBar {
    position: absolute;

    top: 0;
    left: 0;

    width: 100%;
    height: 100%;

    background-color: rgba(255, 0, 0, 0.5);
}


#healthBar {
    position: absolute;

    top: 0;
    left: 0;

    width: 100%;
    height: 100%;

    background-color: #9e9ee9;
}

#aim {
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.5);

    position: absolute;

    transform: translate(-50%, -50%);

    width: 10px;
    height: 10px;
}

.store {
    position: absolute;
    top: 3%;
    right: 3%;

    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr 1fr;
}

.store > h1 {
    font-size: 1.2rem;
}

#level {
    width: 100%;
    height: 100%;

    text-align: center;
}

#cash {
    width: 100%;
    height: 100%;

    text-align: center;
}

#score {
    width: 100%;
    height: 100%;

    text-align: center;
}

#storeFront {
    position: absolute;

    top: 6%;
    left: 2%;

    z-index: 220;

    color: white;
}

.upgrade {
    display: grid;

    grid-template-columns: 1fr 1fr 1fr 1fr;
}

.upgradeButton {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;

    border: 2px solid rgba(255, 255, 255, 0.5);

    padding: 5px;

    text-align: center;
}

.upgradeButton:hover {
    background-color: rgba(255, 255, 255, 0.35);
}

.upgradeCost,
.upgradeName,
.upgradeLevel {
    text-align: left;
    align-self: center;

    padding: 5px;
}

.upgradeCost::before {
    content: "$";
}

.upgradeLevel::before {
    content: "Level: ";
}

#touchEvent {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 200;
}

#deathScreen {
    display: flex;
    flex-direction: column;

    position: absolute;
    top: 0;
    left: 0;

    z-index: 220 !important;
}

#deathScreen > a {
    color: #bbb89b;
    text-decoration: none;
}

#deathScreen > a:hover {
    color: #bbb89b;
    text-decoration: underline;
}