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

html, body {
    background-color: #000;
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: Arial, Helvetica, sans-serif;
}

.center {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
    gap: 10px;
}

.row {
    display: flex;
    gap: 10px;
}

.left {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.game-frame {
    border: 5px solid white;
    width: 700px;
    height: 350px;
    position: relative;
}

.boss {
    position: absolute;
    top: 20px;
    left: 50px;
    width:  32px;
    height: 32px;
    background-color: red;
    border-radius: 50%;
}

.player {
    position: absolute;
    top: 0px;
    left: 0px;
    width:  25px;
    height: 25px;
    background-color: white;
    border-radius: 50%;
}

.upgrades {
    width: 300px;
    max-width: 300px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-height: 300px;
    overflow: auto;
}

h2 {
    font-size: 48px;
}

h3 {
    font-size: 25px;
}

.upgrade {
    padding: 10px;
    border-radius: 5px;
    cursor: pointer;
}

.upgrade:hover {
    background-color: #ff000080;
}