styles.css

body {
    margin: 0;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: antiquewhite;
    height: 100vh;
    width: 100vw;
    font-family: "helvetica", sans-serif;
}

h1 {
    margin: 0;
    padding: 0;
    margin-bottom: 10px;
}

.box {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: aliceblue;
    height: 90vh;
    width: 550px;
    margin-top: 0px;
    padding-top: -50px;
}

.container {
    flex: none;
    display:flex;
    width: 480px;
    height: 480px;
    flex-wrap: wrap;
    margin-top: 20px;
}

.grid {
    width: 30px;
    height: 30px;
    flex: none;
    padding: 0px;
    background-color: gray;
}

button {
    margin: 5px;
    padding: 3px;
    padding-left: 7px;
    padding-right: 7px;
    border: 3px solid peru;
    border-radius: 10px;
    background-color: white;
}