How to create a background color based border in a circle div?

Question

I tried to create a circle which border should look same color as div color and a space between the border and div. The in between space should show the background color of what ever div it is on. the background color is changeable so we shouldn't hardcode it.

Instead i have given transparency using rgba mode. All work fine am trying to get this effect on hover of the circle but i couldn't able to get the hover because i'm trying to display:block on hover and in normal state it is display:none; This are for the after selector hence i tried this effect with after selector.

CODE CSS

.main{
    width:80px;
    height:80px;
    border-radius:100%;
    background-color:#007eff;
    text-align:center;
    line-height:80px;

}
.main:hover + .main:after{
    display:block;

}
.main:after{
      width:86px;
    height:86px;
    border-radius:100%;
    background:rgba(255,255,255,0.1);
    border:2px solid #007eff;
    position:absolute;
    content:"";
    z-index:-1;
    top:3px;
    left:3px;
   display:none;
}
body{
    background-color:#888;
}

HTML

<div class="main"><i class="fa fa-camera-retro fa-lg"></i>
</div>

PROBLEM STATE ON HOVER it should become like THIS with effects if possible If there is any tutorial to do this i'll happy to learn. Thanks

Answer 1

set position:relative; to the .main and set left/right/top/bottom of the .main:after to zero and add transition:all ease 0.3s for animating.

in the .main:hover:after change left/right/top/bottom to -5px.

demo

.main{
    width:80px;
    height:80px;
    border-radius:100%;
    background-color:#007eff;
    text-align:center;
    line-height:80px;
    position:relative;
    margin:6px;
}

.main:after{
    border-radius:100%;
    background:rgba(255,255,255,0.1);
    border:2px solid #007eff;
    position:absolute;
    content:"";
    z-index:-1;
    top:0px;
    left:0;
    bottom:0;
    right:0;
     transition:all ease 0.3s;
}
.main:hover:after{
    top:-5px;
    bottom:-5px;
    right:-5px;
    left:-5px;
}