* {
    box-sizing: border-box;
  }
  
  body {
    height: 100vh;
    margin: 10vmin;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    font-family: 'Open Sans', sans-serif;
  }
  
  header {
    font-size: 6vmin;
    color: darkgray;
    letter-spacing: 1vmin;
  }
  
  #markers {
    display: grid;
    grid-template-columns: repeat(7, 10vmin);
    gap: 1vmin;
    margin-top: 3vmin;
  
  }
  
  #markers > div {
    height: 10vmin;
    border-width: 5vmin;
    border-style: solid;
    border-color: lightgray transparent transparent;
    transform: scale(0.7);
  }
  
  #markers > div:hover {
    transform: scale(0.9);
    transition: 2s, ease-out;
    border-top-color: darkgrey;
  }
  
  #board {
    display: grid;
    grid-template-columns: repeat(7, 10vmin);
    grid-template-rows: repeat(6, 10vmin);
    gap: 1vmin;
    margin-top: -3vmin;
  }
  
  #board > div {
    border-radius: 50%;
    border: 0.1vmin solid black;
  }
  
  button {
    background-color: lightgray;
    margin: 2vmin;
    padding: 2vmin;
    font-size: 2vmin;
    border-radius: 15%;
  }
  
  button:hover{
    background-color: darkgrey;
  }