#back-top {
  bottom: 105px;
  cursor: pointer;
  position: fixed;
  z-index: 30;
  right: 15px;
}
#back-top span {
  width: 50px;
  height: 50px;
  display: block;
  background: url(../images/top_icon.png) no-repeat;
  background-color: #1182fc;
  border-radius: 50%;
  background-size: 100%;
}
#back-top span:hover{
    opacity: 0.7;
    transition: 1s;
}
#btn-chat-facebook { display: block; width: 40px; height: 40px; position: fixed; right: 20px; bottom: 270px; z-index: 99999999999; }
#btn-chat-facebook span {
    display: flex; display: -ms-flex; align-items: center;
     -ms-flex-align: center; width: 40px; height: 40px; border-radius: 50%;
     background: #1182FC; position: relative;top: 2px;
right: 2px;}
#btn-chat-facebook span img {     vertical-align: middle;
position: absolute;
top: 0;
left: 0;
width: 40px;
height: 40px; }

.chat-facebook-fill {width: 60px; height: 60px; top: -10px; position: absolute; -webkit-transition: all 0.2s ease-in-out; -moz-transition: all 0.2s ease-in-out; -ms-transition: all 0.2s ease-in-out; -o-transition: all 0.2s ease-in-out; transition: all 0.2s ease-in-out; -webkit-border-radius: 100%; -moz-border-radius: 100%; border-radius: 100%; border: 2px solid transparent; -webkit-transition: all .5s; -moz-transition: all .5s; -o-transition: all .5s; transition: all .5s; background-color: rgba(17, 130, 252, 0.45); opacity: .75; right: -10px; }
.chat-facebook {width: 50px; height: 50px; top: -5px; right: -5px; position: absolute; background-color: transparent; -webkit-border-radius: 100%; -moz-border-radius: 100%; border-radius: 100%; border: 2px solid rgba(17, 130, 252, .8); opacity: .1; border-color: #1182FC; opacity: .5; }
#khungchatn{
position:fixed;
width:300px;
height:350px;
top:100px;
right:10px;
z-index:999999;
background:#fff;
border-radius:10px;
overflow:hidden;
display:none;
}
#btn-zalo { display: block; width: 40px; height: 40px; position: fixed; right: 20px; bottom: 185px; z-index: 99999999999; }
  #btn-zalo span {
    display: flex; display: -ms-flex; align-items: center;
     -ms-flex-align: center; width: 40px; height: 40px; border-radius: 50%;
     background: #1182FC; position: relative;top: 2px;
    right: 2px;}
  #btn-zalo span img {     vertical-align: middle;
    position: absolute;
    top: 0;
    left: 0;
    width: 40px;
    height: 40px; }

  .kenit-alo-circle-fill {width: 60px; height: 60px; top: -10px; position: absolute; -webkit-transition: all 0.2s ease-in-out; -moz-transition: all 0.2s ease-in-out; -ms-transition: all 0.2s ease-in-out; -o-transition: all 0.2s ease-in-out; transition: all 0.2s ease-in-out; -webkit-border-radius: 100%; -moz-border-radius: 100%; border-radius: 100%; border: 2px solid transparent; -webkit-transition: all .5s; -moz-transition: all .5s; -o-transition: all .5s; transition: all .5s; background-color: rgba(17, 130, 252, 0.45); opacity: .75; right: -10px; }
  .kenit-alo-circle {width: 50px; height: 50px; top: -5px; right: -5px; position: absolute; background-color: transparent; -webkit-border-radius: 100%; -moz-border-radius: 100%; border-radius: 100%; border: 2px solid rgba(17, 130, 252, .8); opacity: .1; border-color: #1182FC; opacity: .5; }