.clock-time {
    font-size: 100px;
  }

.btn-circle-flat0 {
  display: inline-block;
  text-decoration: none;
  background: #87befd;
  color: #FFF;
  width: 200px;
  height: 200px;
  line-height: 200px;
  border-radius: 50%;
  text-align: center;
  overflow: hidden;
  transition: .4s;
}

.btn-circle-flat0:hover {
  background: #668ad8;
}

.btn-circle-flat1 {
  display: inline-block;
  text-decoration: none;
  background: #a5dcb0;
  color: #FFF;
  width: 200px;
  height: 200px;
  line-height: 200px;
  border-radius: 50%;
  text-align: center;
  overflow: hidden;
  transition: .4s;
}

.btn-circle-flat1:hover {
  background: #156950;
}

.btn-circle-flat2 {
  display: inline-block;
  text-decoration: none;
  background: #87befd;
  color: #FFF;
  width: 200px;
  height: 200px;
  line-height: 200px;
  border-radius: 50%;
  text-align: center;
  overflow: hidden;
  transition: .4s;
}

.btn-circle-flat2:hover {
  background: #668ad8;
}

.btn-circle-flat3 {
  display: inline-block;
  text-decoration: none;
  background: #a5dcb0;
  color: #FFF;
  width: 200px;
  height: 200px;
  line-height: 200px;
  border-radius: 50%;
  text-align: center;
  overflow: hidden;
  transition: .4s;
}

.btn-circle-flat3:hover {
  background: #156950;
}

.btn-circle-flat4 {
  display: inline-block;
  text-decoration: none;
  background: #e9bde5;
  color: #FFF;
  width: 200px;
  height: 200px;
  line-height: 200px;
  border-radius: 50%;
  text-align: center;
  overflow: hidden;
  transition: .4s;
}

.btn-circle-flat4:hover {
  background: #e688d0;
}