按钮模版：btn-light-1

<div class="container">
  <button class="btn-light-1">View Room</button>
</div>

.container {
  display: flex;
  justify-content: center;
  align-items: center;
  background: #fff;
  width: 100%;
  height: 200px;
}
.btn-light-1 {
  width: 120px;
  height: 52px;
  position: relative;
  box-sizing: border-box;
  font-size: 16px;
  font-weight: bold;
  color: #333;
  background-color: transparent;
  transition: all 0.4s ease-in-out;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  z-index: 1;
}
.btn-light-1:before {
  content: "";
  width: 4px;
  height: inherit;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 0;
  background-color: #333;
  border-radius: 2px;
  transition: all 0.4s ease-in-out;
  z-index: -1;
}
.btn-light-1:hover {
  color: #fff;
}
.btn-light-1:hover:before {
  width: 100%;
}