JSFiddle - React, Tailwind, and code Playground

HTML

<div class="header">
  <h1>Minesweeper!!!!</h1>
  <p>Made by Desmond</p>
</div>
<div class="sub-header">
  <div class="img-box" id="left">
    <img src="#" id="smile" alt="this game is broken!" />
  </div>
  <div class="img-box" id="right">
    <img src="#" id="flag" alt="This game is broken!" />
  </div>
  <p id="score">Score: </p>
</div>
<div class="body">
  <div class="grid-box">
    <div class="button" id="5x5">
      <p>Easy (5x5)</p>
    </div>
    <div class="button" id="8x8">
      <p>Medium (8x8)</p>
    </div>
    <div class="button" id="10x10">
      <p>Hard (10x10)</p>
    </div>
  </div>
</div>

CSS

.header {
  width: 100%;
  height: 20%;
  border-bottom: 2px solid #efefef;
  border-radius: 5px;
  background: #80ffff;
  text-align: center;
  font-family: "Comic Sans MS", cursive;
}

.sub-header {
  width: 100%;
  height: 10%;
  border-bottom: 2px solid #efefef;
  border-radius: 5px;
  background: #e5ffff;
}

.img-box {
  display: inline-block;
  position: relative;
  width: 50px;
  height: 50px;
  background: radial-gradient(#cccccc 20%, #999999 80%);
  border: 2px solid #cccccc;
  border-radius: 2px;
  align-content: center
}

.img-box img {
  vertical-align: middle;
}

.button {
  position: relative;
  background-color: #efefef;
  height: 30px;
  width: 100px;
  border: 2px #999999 solid;
  border-radius: 8px;
  font-family: "Modern No. 20";
  font-weight: bold;
  margin-left: 100px;
}

.button p {
  position: absolute;
  top: -8px;
}

.header p {
  text-shadow: 2px 2px gray;
  right: 1px;
}

.sub-header {
  text-align: center;
  margin-top: 0px;
}

.body {
  background: #d9d9d9;
  height: 1000px;
  width: 100%;
}

#8x8 {
  left: 500px;
}

#10x10 {
  left: 1000px;
}

.grid-box {}