style.css

body {
    text-align: center;
     background-size: cover;           
    background-repeat: no-repeat;
    background-position: center;
}


h2 {
    margin: 1em 0 0.25em;
  font-family: Arial;
  color: #46C6B5;
  
  
}


h2:first-of-type {
    margin-top: 0.5em;
}

table,
tr,
td {
    border: 1px solid black;
}

table {
    border-collapse: collapse;
    margin: 0 auto;
}

tr {
    height: 20px;
}

td {
    width: 20px;
}

input[type=number] {
    width: 6em;
}

.game {
  border: 1px solid lightgray;
  background-color: white;
  border-radius: 9px;
  width: 600px;
  height: 900px;
  padding: 5px 5px 10px 5px;
  margin: auto;
  box-shadow: 9px 10px 40px -12px rgba(107, 105, 107, 0.9);
}