Example of a chat bubble?

i’m trying to make a ionic button into a speech bubble but it doesn’t shows up

.speech-bubble {
position: relative;
background: #00aabb;
border-radius: .4em;
}

.speech-bubble:after {
content: ‘’;
position: absolute;
right: 0;
top: 50%;
width: 0;
height: 0;
border: 31px solid transparent;
border-left-color: #00aabb;
border-right: 0;
border-bottom: 0;
margin-top: -15.5px;
margin-right: -31px;
}