SOURCE

<div class="outer">
  <input type="text" class="test-input">
</div>

<div class="outer">
  <div class="test-input"></div>
</div>

<div class="outer">
  <button class="test-input">7YYY</button>
</div>

.outer{
  border: 1px solid red;
}

.test-input{
  display: inline-block;
  height: 100px;
  width:100px;
  border:1px solid green;
}

button {
  //vertical-align:bottom;
}