style.css

body {
    background: url(ressources/Images/Cockpit.png) no-repeat center fixed;
    background-size: cover;
}

.grille {
    display: flex;
    flex-wrap: wrap;
    border: 1px solid #000;
    width: 500px;
    height: 500px;
    border-radius: 15px;
    margin: 10% auto 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    background: url(ressources/Images/Space.png);
    background-position: center;
    animation: background-defile 30s linear infinite;
    position: relative;
    bottom: 90px;
}

@keyframes background-defile {
    from {
        background-position-y: 0;
    }
    to {
        background-position-y: 500px;
    }
}

h3 {
    text-align: center;
    margin: 50px 0;
}

.grille div {
    width: 25px;
    height: 25px;
}

.tireur {
    background: url(ressources/Images/vaisseau.png);
    transform: rotate(180deg);
    background-position: center;
    background-size: contain;
    position: absolute;
}

.alien {
    background: url(ressources/Images/ennemies.png);
    background-position: center;
    background-size: contain;
}

.boom {
    background-color: red;
}

.laser {
    background-color: orange;
}

.enemy-container {
    position: relative;
    height: 50% !important;
    width: 100% !important;
    background-color: transparent;
    display: flex;
    justify-content: center;
    flex-direction: column;
}

.enemy-column {
    width: auto !important;
    display: flex;
    flex-direction: row;
    position: absolute;
    top: 0;
}

.player-column {
    width: auto !important;
    display: flex;
    flex-direction: row;
    position: absolute;
    top: 0;
}

.player-container {
    position: relative;
    height: 50% !important;
    width: 100% !important;
    background-color: transparent;
    display: flex;
    justify-content: center;
    flex-direction: column;
}

.bullet {
    background-color: rgb(255, 145, 0) !important;
    border: 1px solid rgb(255, 60, 0) !important;
    box-shadow: 0 0 15px rgb(255, 228, 228) !important;
    transform: translateX(150%);
    width: 5px !important;
    height: 15px !important;
    border-radius: 10px;
}

.score {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 20%;
    height: 20%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: rgba(0, 0, 0, 0.651);
    color: rgb(255, 0, 0);
    font-size: 3em;
    font-weight: bold;
    text-shadow: 0 0 10px black;
    margin: 0;
}

.score .multiplier {
    font-size: 16px;
    color: goldenrod;
    margin-left: 10px;
    rotate: 15deg;
    position: absolute;
    top: 30%;
    left: 50%;
}

.message {
    position: absolute;
    top: 40%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: rgba(0, 0, 0, 0.651);
    color: rgb(255, 0, 0);
    font-size: 3em;
    font-weight: bold;
    text-shadow: 0 0 10px black;
}

.restartDiv {
    position: absolute;
    top: 70%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 30%;
    height: 30%;
    display: flex;
    justify-content: center;
    align-items: center;
    text-decoration: none;
}

.restartBtn {
    position: absolute;
    top: 80%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 50%;
    border-radius: 40px;
    box-shadow: 0 0 10px rgb(255, 255, 255);
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: rgba(154, 255, 113, 0.651);
    color: rgb(255, 65, 65);
    font-size: 2em;
    font-weight: bold;
    text-shadow: 0 0 10px black;
}


/* Create a score board at the top left of the screen */

.score-board {
    position: absolute;
    top: 0;
    left: 0;
    width: 20%;
    max-width: 300px;
    height: 80%;
    display: block;
    flex-wrap: wrap;
    text-align: center;
    background-color: rgba(0, 0, 0, 0.651);
    color: rgb(97, 201, 0);
    text-shadow: 0 0 10px black;
    margin: 0;
}

#scoreBoardTitle {
    font-size: 1em;
    font-weight: bold;
    margin-bottom: 10px;
    padding: 10px;
    height: 10%;
}

.score-board h2 {
    font-size: 2.5em;
    font-weight: bold;
    width: 100%;
    height: 30px;
    margin: 0;
}

.score-board p {
    font-size: 1.5em;
    color: rgb(184, 184, 184);
    height: 30px;
    margin: 0
}