<div class="wrap">
  <div class="container">
    <h1>300ms</p>
    <div class="box1 box"></div>
  </div>
   <div class="container">
    <h1>1s</p>
    <div class="box2 box"></div>
  </div>
   <div class="container">
    <h1>3s</p>
    <div class="box3 box"></div>
  </div>
</div>

.wrap {
  margin: 50px;
}

.container {
  display: inline-block;
  width: 150px;
}

h1 {
  color: lightgray;
  font-family: lato;
  font-size: 20px;
  font-weight: 200;
  padding: 20px;
  text-align: center;
}

.box {
  border-radius: 50%;
  height: 40px;
  margin: 50px auto;
  width: 40px;
  
  .wrap:hover & {
    transform: scale(2);
  }
}

.box1 {
  background: #60D4C8;
  transition: all 300ms;
}

.box2 {
  background: #46BAAF;
  transition: all 1s;
}

.box3 {
  background: #3EA69B;
  transition: all 3s;
}