Call button with CSS & HTML

call.html

<a href="tel:<phone number>" title="" class="btn-call">
    <span><i class="fa fa-phone"></i></span>
</a>

style.css

.btn-call{
    position: fixed;
    top: 100px;
    right: 40px;
    z-index: 9999;
}
.btn-call strong{
    background: #76B82C;
    display: inline-block;
    border-radius: 8px 0 0 8px;
    color: #fff;
    font-size: 20px;
    font-family: "OpenSans";
    position: absolute;
    right: 72px;
    top: 50%;
    height: 40px;
    line-height: 40px;
    margin-top: -20px;
    margin-right: 15px;
    opacity: 0;
    pointer-events: none;
    -webkit-transition: all .35s ease-in-out;
    -moz-transition: all .35s ease-in-out;
    -ms-transition: all .35s ease-in-out;
    -o-transition: all .35s ease-in-out;
    transition: all .35s ease-in-out;
    min-width: 160px;
    text-align: center;

    font-weight: normal;
}
.btn-call strong:after{
    width: 0;
    height: 0;
    border-top: 20px solid transparent;
    border-left: 10px solid #76B82C;
    border-bottom: 20px solid transparent;
    content: '';
    position: absolute;
    left: 100%;
    top: 0;
}
.btn-call:hover strong{
    opacity: 1;
    pointer-events: all;
    margin-right: 0px;
}
.btn-call span{
    display: block;
    font-size: 42px;
    width: 60px;
    height: 60px;
    margin: auto;
    border-radius: 50% !important;
    line-height: 60px;
    text-align: center;
    color: #fff;
    background: #76B82C;
    position: relative;
}
.btn-call span i{
    animation-name: lac;
    -webkit-animation-name: lac;
    animation-duration: 1s;
    -webkit-animation-duration: 1s;
    animation-iteration-count: infinite;
    -webkit-animation-iteration-count: infinite;
}

.btn-call span:before{
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 50%;
    border: solid 1px rgba(118, 184, 44, 0.6);
    animation-name: zoomin;
    -webkit-animation-name: zoomin;

    animation-name: zoomin;
    -webkit-animation-name: zoomin;

    animation-duration: 1.5s;
    -webkit-animation-duration: 1.5s;

    animation-iteration-count: infinite;
    -webkit-animation-iteration-count: infinite;
}

.btn-call span:after{
    content: '';
    position: absolute;
    top: -10px;
    left: -10px;
    right: -10px;
    bottom: -10px;
    border-radius: 50%;
    background: rgba(118, 184, 44, 0.6);
    z-index: -1;

    animation-name: zoomout;
    -webkit-animation-name: zoomout;

    animation-duration: 1s;
    -webkit-animation-duration: 1s;

    animation-iteration-count: infinite;
    -webkit-animation-iteration-count: infinite;

    -webkit-animation-direction: alternate;
    animation-direction: alternate;
}
@keyframes lac {
    0% {transform: rotate(0deg);}
    10% {transform: rotate(-25deg);}
    20% {transform: rotate(25deg);}
    30% {transform: rotate(-25deg);}
    40% {transform: rotate(25deg);}
    50% {transform: rotate(0deg);}
    100% {transform: rotate(0deg);}
}
@-webkit-keyframes lac {
    0% {-webkit-transform: rotate(0deg);}
    10% {-webkit-transform: rotate(-25deg);}
    20% {-webkit-transform: rotate(25deg);}
    30% {-webkit-transform: rotate(-25deg);}
    40% {-webkit-transform: rotate(25deg);}
    50% {-webkit-transform: rotate(0deg);}
    100% {-webkit-transform: rotate(0deg);}
}
@keyframes zoomin{
	0%{transform: scale(.8);opacity: 1;}
	100%{transform: scale(2.2);opacity: .1;}
}
@-webkit-keyframes zoomin{
	0%{-webkit-transform: scale(.8);opacity: 1;}
	100%{-webkit-transform: scale(2.2);opacity: .1;}
}
@keyframes zoomout{
	0%{transform: scale(0.8);opacity: 1;}
	100%{transform: scale(1.1);opacity: .3}
}
@-webkit-keyframes zoomout{
	0%{-webkit-transform: scale(0.8);opacity: 1;}
	100%{-webkit-transform: scale(1.1);opacity: .3;}
}