style.css

/*
  1. Use a more-intuitive box-sizing model.
*/
*, *::before, *::after {
    box-sizing: border-box;
  }
  /*
    2. Remove default margin
  */
  * {
    margin: 0;
  }
  /*
    Typographic tweaks!
    3. Add accessible line-height
    4. Improve text rendering
  */
  body {
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
  }
  /*
    5. Improve media defaults
  */
  img, picture, video, canvas, svg {
    display: block;
    max-width: 100%;
  }
  /*
    6. Remove built-in form typography styles
  */
  input, button, textarea, select {
    font: inherit;
  }
  /*
    7. Avoid text overflows
  */
  p, h1, h2, h3, h4, h5, h6 {
    overflow-wrap: break-word;
  }
  /*
    8. Create a root stacking context
  */
  #root, #__next {
    isolation: isolate;
  }

  html,body{
    height: 100%;
  }

  body{
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    gap: 4rem;
    background-color: rgb(19, 19, 19);
  }

  .container{
    display: grid;
    margin-top: 5rem;
    grid-template-rows: repeat(3,200px);
    grid-template-columns: repeat(3,200px);
  }

  .box1{
    border-right: 1px solid white; 
    border-bottom: 1px solid white; 
  }
  .box3{
    border-left: 1px solid white; 
    border-bottom: 1px solid white; 
  }
  .box7{
    border-right: 1px solid white; 
    border-top: 1px solid white; 
  }
  .box9{
    border-left: 1px solid white; 
    border-top: 1px solid white; 
  }
  .box5{
    border: 1px solid white;
  }

  .box{
    display: flex;
    justify-content: center;
    align-items: center;
    
  }

    .x{
        font-family:'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
        font-weight: 100;
        padding-bottom: 2.5rem;
        font-size: 200px;
        color: rgba(106, 221, 29, 0.909);
    }
  .o{
    font-family: 'Courier New', Courier, monospace;
    font-weight: 400;
    padding-bottom: 1.5rem;
    font-size: 250px;
    color: #ce0808;
  }

  .reset{
    font-family: 'Courier New', Courier, monospace;
    font-size: 2rem;
    color: aliceblue;
    border: 1px solid white;
    background-color: rgb(49, 48, 48);
    border-radius: 12px;
    box-shadow: 0 0 10px white;
    margin-bottom: 2rem;
  }
  .reset:hover{
    border: 1px solid greenyellow;
    color: greenyellow;
    scale: 1.1;
  }
  .reset:active{
    
    color: rgb(0, 187, 255);
    border: 1px solid rgb(0,187,255);
    scale: 1.05;
  }