style.css

* {
    box-sizing: border-box;
}
body {
    margin: 0 auto;
    width: 60%;
    font-family: 'Cantarell', sans-serif;
}
.game-header {
    font-family: 'Economica', sans-serif;
    font-size: 100px;
    margin: 5px;
}
.board-section {
    width: 100%;    
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    text-align: center;
}
.board-section__field {
    height: 50px;
    width: 50px;
    background-color:lightblue;
    color: white;
    font-weight: bold;
    font-size: 30px;
    margin: 5px;
}
.errors-section__paragraph {
    height: 10px;
    color: black;
}
.errors-section__paragraph--pink {
    color: #FF9494;
}
.new-game-section {
    margin: 10px;
    text-align: center;
}
.answer-section {
    padding-top: 15px;
    text-align: center;
}
.field {
    width: 70%;
    padding: 5px 5px;
    margin: 3px 0;
    border: 2px solid gainsboro;
    border-radius: 4px;
}
.button {
    color: gray;
    background-color: gainsboro;
    width: 20%;
    padding: 5px 5px;
    margin: 3px 0;
    border: 2px solid gainsboro;
    border-radius: 4px; 
}
.button:hover {
    background-color: rgba(220, 220, 220, 0.598);
}
/* mobile version */
@media only screen and (max-width: 800px) {
    body {
        width: 95%;
    }
    .board-section__field {
        width: 40px;
        height: 40px;
        margin: 2px;
    }
    .field {
        width: 60%;
    }
    .button {
        width: 30%; 
    }
}