index.css

body {
    margin: 0;
    color: #EEEEEE;
    background : #1B244A;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
}

.container {
    display: flex;
    justify-content: space-around;

}

.score-box {
    width: 155px;
    height: 120px;
    background-color: #080001;

}

.score {
    width: 155px;
    height: 120px;
    background-color: #080001;
    font-family: digital;
    font-size: 70px;
    margin: 0;
    text-align: center;
    padding: 30px 0 0 0;
    color: #F94F6D;
}

h3 {
    text-align: center;
    margin: 20px 0 10px 0;
}

.add-btn {
    color: #9AABD8;
    background-color: #1B244A;
    font-family: digital;
    font-size: 1.1em;
    border: solid 1px #9AABD8;
    border-radius: 3px;
    padding: 3px 6px;
    margin: 25px 6px 0 6px;
}

.new-game {
width: 120px;
 margin: 40px auto 0;
}

#newgame-btn {
    height: 90px;
    width: 120px;
    font-size: 1.3em;
    background-color: rgb(222, 238, 144);
    font-weight: 600;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    border-block-start-width: 2px 2px 0 black;
    border: none;
    border-radius: 3px;
}