两个按钮在simon游戏中不会居中

如何将“开始”和“严格”按钮提升到相同的显示级别(游戏中心的控件)。并将文本居中。每当我减小显示字体的大小时,圆圈(start,strict)就会出现,反之亦然。我希望这两个按钮与显示屏对齐。他们是,但他们不在同一水平。并且按钮内的文本没有垂直居中。我到处找css规则来垂直对齐文本,找不到。。有人能帮忙吗。谢谢 https://codepen.io/zentech/pen/XaYygR

<div class="container">
  <div class="header">
    <h1>SIMON</h1>
  </div>
  <div class="simonBoard">
      <div class="pad pad-green"></div>
      <div class="pad pad-red"></div>
      <div class="pad pad-yellow"></div>
      <div class="pad pad-blue"></div>   
    <div class="board-controls">
      <div class="title">SIMON</div>
      <div class="display inline">00</div>
      <div class="start inline">START</div>
      <div class="strict inline">STRICT</div>
      <div class="switch">
        <h3 class="inline">ON</h3>
        <div class="outter-switch inline"><div class="inner-switch"></div></div>
        <h3 class="inline">OFF</h3>
      </div>
    </div>
</div>
</div>

风格

body {
  background: url("http://cdn.backgroundhost.com/backgrounds/subtlepatterns/purty_wood.png");
  font-family: 'Righteous', cursive;
  color: black;
}

.container {
  margin: 0 auto;
  text-align: center;
}

h1 {
  font-size: 70px;
}

.simonBoard {
  margin: 0 auto;
/*   margin-top: 100px; */
  border: solid 10px black;
  width: 600px;
  height: 600px;
  border-radius: 600px;
  box-shadow: -10px 10px 7px 0px rgba(50, 50, 50, 0.75);
}

.pad {
  margin: 0;
  float: left;
  position: relative;
  width: 290px;
  height: 290px;
  z-index: 8;
  border: 5px solid black;
}

.pad-green {
    background-color:#0a0;
    -moz-border-radius: 300px 0 0 0;
    border-radius: 300px 0 0 0;    
}

.pad-red {
  background-color: red;
  -moz-border-radius: 0 300px 0 0;
  border-radius: 0 300px 0 0;
}

.pad-yellow {
  background-color: yellow;
  -moz-border-radius: 0 0 0 300px;
  border-radius: 0 0 0 300px;
}

.pad-blue {
  background-color: blue;
  -moz-border-radius: 0 0 300px 0;
  border-radius: 0 0 300px 0;
}

.board-controls {
  border: 15px solid black;
  height: 245px;
  width: 245px;
  border-radius: 150px;
  background-color: white;
  clear: both;
  position: absolute;
  z-index: 10;
  margin-top: 160px;
  margin-left: 160px;
  -webkit-box-shadow: -6px 8px 5px 0px rgba(50, 50, 50, 0.75);
}

.title {
  font-size: 45px;
  margin-top: 30px;
  font-weight: bold;
}

.inline {
  display: inline-block;
}

.display {
  margin-left: 0px;
  margin-top: 20px;
  border: solid 2px black;
  border-radius: 10px;
  color: white;
  width: 60px;
  height: 45px;
  font-size: 37px;
  background-color: #342626;
}

.start {
  text-align: center;
  margin: 0;
  margin-left: 20px;
  border: solid 3px black;
  width: 50px;
  height: 50px;
  border-radius: 30px;
  color: black;
  background-color: darkred;
}

 .strict {
  text-align: center;
  margin: 0px;
  margin-left: 20px;
  border: solid 3px black;
  width: 50px;
  height: 50px;
  border-radius: 30px;
  color: black;
  background-color: yellow;
}

.inner-switch {
  background-color: gray;
  width: 30px;
  height: 25px;
  position: relative !important;
}

.outter-switch {
  margin-top: 20px;
  border: solid 2px black;
  width: 60px;
  height: 25px;
  background-color: black;  
}