How to display circle around button on focus

[alekseyr]

Given stylesheet for a button:

top: 960px;
left: 944px;
width: 40px;
height: 40px;
background: transparent url('img/play_circle_filled-24px-2.png') 0% 0% no-repeat padding-box;
opacity: 1;

and stylesheet for a circle around it:
top: 944px;
left: 928px;
width: 72px;
height: 72px;
background: #EEEEEE 0% 0% no-repeat padding-box;
opacity: 0.2;

how to make the circle visible on focus only? Is it possible inside one stylesheet (QAbstractButton{) or it'll need to use some QLabel for this task?
I'm totally incompetent in css, so I'm here to ask you.

P.S The following stylesheet makes almost what I want except it doesn't draw circle but square.

"QAbstractButton {"
"top: 960px;"
"left: 944px;"
"width: 40px;"
"height: 40px;"
"border-image: url('img/play_circle_filled-24px-2.png') 0% 0% no-repeat padding-box;"
"opacity: 1;"
"}"

"QAbstractButton:focus {"
"border-radius: 72px;"
"background-color: blue ;"
"opacity: 0.2;"
"}"

[Mammamia]

@alekseyr here is a sample Stylesheet for Button which shows color on focus using QPushButton:focus

QPushButton
{
    color: #b1b1b1;
    background-color: QLinearGradient( x1: 0, y1: 0, x2: 0, y2: 1, stop: 0 #565656, stop: 0.1 #525252, stop: 0.5 #4e4e4e, stop: 0.9 #4a4a4a, stop: 1 #464646);
    border-width: 1px;
    border-color: #1e1e1e;
    border-style: solid;
    border-radius: 6;
    padding: 3px;
    font-size: 12px;
    padding-left: 5px;
    padding-right: 5px;
}
QPushButton:pressed
{
    background-color: QLinearGradient( x1: 0, y1: 0, x2: 0, y2: 1, stop: 0 #2d2d2d, stop: 0.1 #2b2b2b, stop: 0.5 #292929, stop: 0.9 #282828, stop: 1 #252525);
}
QPushButton:hover
{
    border: 2px solid QLinearGradient( x1: 0, y1: 0, x2: 0, y2: 1, stop: 0 #ffa02f, stop: 1 #d7801a);
}
QPushButton:focus
{
border: 2px solid QLinearGradient( x1: 0, y1: 0, x2: 0, y2: 1, stop: 0 #ffa02f, stop: 1 #d7801a);
}

above stylesheet is extracted from here http://www.yasinuludag.com/darkorange.stylesheet

I hope this will give you a hint to show the circle on focus