.button {
  position: relative;
  padding: 10px 20px;
  border: none;
  color: #007ffe;
  cursor: pointer;
  transition: .3s;
  transition-delay: .3s;
  z-index: 0;
}

.button::after {
  position: absolute;
  content: '';
  width: 17px;
  height: 17px;
  background-color: #007ffe;
  right: -20px;
  border-radius: 50%;
  top: 50%;
  transform: translateY(-50%);
  transition: .3s;
  opacity: 0;
}

.button::before {
  position: absolute;
  z-index: 0;
  content: '';
  width: 17px;
  height: 17px;
  background-color: #007ffe;
  left: -20px;
  border-radius: 50%;
  top: 50%;
  transform: translateY(-50%);
  transition: .3s;
  opacity: 0;
}

button:hover::after {
  z-index: -1;
  right: 0;
  width: 50%;
  height: 100%;
  border-radius: 0;
  opacity: 1;
}

button:hover::before {
  z-index: -1;
  left: 0;
  width: 50%;
  height: 100%;
  border-radius: 0;
  opacity: 1;
}

button:hover {
  color: #fff;
  box-shadow: 10px 50px 50px rgba(52, 152, 219,.2);
}