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    * {
      margin: 0;
      padding: 0;
      font-family: 'comic sans ms';
    }
    body {
      text-align: center;
    }
    button {
      width: 62px;
      height: 59px;
      background-color: white;
      font-size: 14px;
      text-align: center;
      border: 2px solid black;
      border-radius: 5px;
      margin: 2px;
      box-shadow: 0 8px 16px 0 rgba(0, 0, 0, 0.2),
        0 6px 20px 0 rgba(0, 0, 0, 0.19);
      cursor: pointer;
    }
    button:hover {
      box-shadow: 0px 4px 4px 4px rgba(79, 239, 239, 61),
        2px 4px 4px 0px rgba(0, 255, 255, 61);
      border: 1px solid black;
    }
    .buttonHighlight {
      box-shadow: 0px 4px 4px 4px rgba(79, 239, 239, 61),
        2px 4px 4px 0px rgba(0, 255, 255, 61);
      border: 1px solid black;
    }
    .f_div {
      position: relative;
      background-color: #cccccc;
      width: 1087px;
      height: 342px;
      margin: 100px 10%;
      border-radius: 10px;
      display: flex;
    }
    #s_div {
      position: absolute;
      top: 10px;
    }


 <div class="f_div">
      <div id="s_div">
        <!-- 第一排 -->
        <button>`</button>
        <button>1</button>
        <button>2</button>
        <button>3</button>
        <button>4</button>
        <button>5</button>
        <button>6</button>
        <button>7</button>
        <button>8</button>
        <button>9</button>
        <button>0</button>
        <button>-</button>
        <button>+</button>
        <button style="width: 134px;">Backspace</button>
        <!-- 第二排 -->
        <button style="width: 98px;">Tab</button>
        <button>Q</button>
        <button>W</button>
        <button>E</button>
        <button>R</button>
        <button>T</button>
        <button>Y</button>
        <button>U</button>
        <button>I</button>
        <button>O</button>
        <button>P</button>
        <button>[</button>
        <button>]</button>
        <button style="width: 98px;">\</button>
        <!-- 第三排 -->
        <button style="width: 134px;">CapsLock</button>
        <button>A</button>
        <button>S</button>
        <button>D</button>
        <button>F</button>
        <button>G</button>
        <button>H</button>
        <button>J</button>
        <button>K</button>
        <button>L</button>
        <button>;</button>
        <button>'</button>
        <button style="width: 134px;">Enter</button>
        <!-- 第四排 -->
        <button style="width: 170px;">Shift</button>
        <button>Z</button>
        <button>X</button>
        <button>C</button>
        <button>V</button>
        <button>B</button>
        <button>N</button>
        <button>M</button>
        <button>,</button>
        <button>.</button>
        <button>/</button>
        <button style="width: 170px;">Shift</button>
        <!-- 第五排 -->
        <button style="width: 98px;">Control</button>
        <button>Meta</button>
        <button>Alt</button>
        <button style="width: 450px;" id="blank">span</button>
        <button>Alt</button>
        <button>Meta</button>
        <button style="width: 103px;">ContextMenu</button>
        <button style="width: 98px;">Control</button>
      </div>
    </div>

 <script>
      function keyboardHighlight() {
        let index = []
        let but = document.getElementsByTagName('button')
        let blank = document.getElementById('blank')
        document.onkeydown = function (event) {
          let e = event || window.event || arguments.callee.caller.arguments[0]
          //console.log(e.keyCode)
          for (let i = 0; i < but.length; i++) {
            if (
              but[i].innerText.toUpperCase() === e.key.toUpperCase() &&
              e.keyCode != 18 &&
              e.keyCode != 17 &&
              e.keyCode != 91
            ) {
              but[i].classList.add('buttonHighlight')
              index[0] == i ? '' : index.push(i)
            }
          }
          if (e.keyCode === 32) {
            blank.classList.add('buttonHighlight')
            but[index[0]].classList.remove('buttonHighlight')
          } else {
            blank.classList.remove('buttonHighlight')
          }
          if (index.length >= 2) {
            but[index[0]].classList.remove('buttonHighlight')
            index.splice(0, 1)
          }
        }
      }
      keyboardHighlight()
    </script>