.wrapper {
    height: 0vh;
    background: #333;
  }
  
  #main-div {
    position: fixed;
    right: 20px;
    bottom: 20px;
    z-index: 0;
  }
  
  #main-button {
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    right: 0;
    bottom: 0;
    height: 50px;
    width: 50px;
    font-size: 20px;
    color: #0064f3;
    cursor: pointer;
    background-color: #fff;
    box-shadow: 0 0 10px 0 rgba(0,0,0,.5);
    border-radius: 50%;
    -webkit-border-radius: 50%;
    -moz-border-radius: 50%;
    -ms-border-radius: 50%;
    -o-border-radius: 50%;
  }
  
  #main-button ~ button {
    visibility: hidden;
    font-weight: 600;
    height: 50px;
    padding: 0 20px;
    color: #fff;
    background: linear-gradient(90deg, #00a1f5, #0064f3);
    box-shadow: 0 0 10px 0 rgba(0,0,0,.5);
    border: 0;
    position: absolute;
    z-index: -1;
    right: 0;
    bottom: 0;
    opacity: 0;
    white-space: nowrap;
    cursor: pointer;
    transition: .2s all linear;
    -webkit-transition: .2s all linear;
    -moz-transition: .2s all linear;
    -ms-transition: .2s all linear;
    -o-transition: .2s all linear;
    border-radius: 5px;
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    -ms-border-radius: 5px;
    -o-border-radius: 5px;
  }
  
  #main-button.open ~ button {
    visibility: visible;
    right: 70px;
    opacity: 1;
    transition: .4s all cubic-bezier(0, 0.01, 0, 1.27);
    -webkit-transition: .4s all cubic-bezier(0, 0.01, 0, 1.27);
    -moz-transition: .4s all cubic-bezier(0, 0.01, 0, 1.27);
    -ms-transition: .4s all cubic-bezier(0, 0.01, 0, 1.27);
    -o-transition: .4s all cubic-bezier(0, 0.01, 0, 1.27);
  }
  
  #main-button ~ a {
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    position: absolute;
    right: 0;
    bottom: 0;
    z-index: -1;
    height: 50px;
    width: 50px;
    font-size: 20px;
    opacity: 0;
    text-decoration: none;
    color: #fff;
    background-color: #fff;
    box-shadow: 0 0 10px 0 rgba(0,0,0,.5);
    border-radius: 50%;
    -webkit-border-radius: 50%;
    -moz-border-radius: 50%;
    -ms-border-radius: 50%;
    -o-border-radius: 50%;
    transition: .2s all linear;
    -webkit-transition: .2s all linear;
    -moz-transition: .2s all linear;
    -ms-transition: .2s all linear;
    -o-transition: .2s all linear;
  }
  
  #main-button ~ .telegram-color {
    background: linear-gradient(0deg, #017AB1, #01ABE6);
  }
  
  #main-button ~ .whatsapp-color {
    background: linear-gradient(0deg, #00B100, #09db09);
  }
  
  #main-button ~ .messenger-color {
    background: linear-gradient(0deg, #0078FF, #00C6FF);
  }
  
  #main-button.open ~ a {
    opacity: 1;
    transition: .4s all cubic-bezier(0, 0.01, 0, 1.27);
    -webkit-transition: .4s all cubic-bezier(0, 0.01, 0, 1.27);
    -moz-transition: .4s all cubic-bezier(0, 0.01, 0, 1.27);
    -ms-transition: .4s all cubic-bezier(0, 0.01, 0, 1.27);
    -o-transition: .4s all cubic-bezier(0, 0.01, 0, 1.27);
  }
  #main-button.open ~ a:nth-of-type(1) {
    bottom: 60px;
  }
  #main-button.open ~ a:nth-of-type(2) {
    bottom: 120px;
  }
  #main-button.open ~ a:nth-of-type(3) {
    bottom: 180px;
  }
  
  .wave {
    animation-name: wave;
    animation-duration: 1s;
    animation-timing-function: linear;
    animation-iteration-count: infinite;
  }
  
  @keyframes wave {
    0% {box-shadow: 0 0 0px 0px rgba(255, 255, 255, 0.5);}
    100% {box-shadow: 0 0 0px 10px rgba(255, 255, 255, 0);}
  }
  
  .open {
    animation-iteration-count: 1;
  }