.float1{
    position:fixed;
    width:55px;
    height:55px;
    bottom:20px;
    left:20px;
    background-color:darkviolet;
    color:#FFF;
    border-radius:50px;
    text-align:center;
  font-size:35px;
  z-index:100;
}

.my-float1{
    margin-top:10px;
}

.float1:hover
  
  { background: #F00; 
    color: #fff;
  }