html {
  background: #808080;
}
#particles-js {
  position: fixed;
  z-index: -1;
  left: 0;
  top: 0;
  width: 100%;
  height: 100vh;
  background: #333;
  background: linear-gradient(90deg,#F24645  ,#4F00BC );
}
.count-particles {
  box-sizing: border-box;
  position: relative;
  width: 200px;
  height: 100px;
  background-color: white;
  z-index: 2;
  margin: 50px auto;
  text-align: center;
  font-size: 29px;
  background: linear-gradient(90deg, #808080, #e6e6e6);
  border-radius: 10px;
  padding: 31px;
  color: green;
  box-shadow: 0 0 30px #fff, 0 0 50px #fff inset;
  cursor: pointer;
}

.count-particles:hover {
  box-shadow: 0 0 50px #44c1eb, 0 0 50px #44c1eb inset;
  color: #44c1eb;
}