Kanboard-Prod/assets/css/src/avatar.css

.avatar {
    float: left;
    margin-right: 10px;
}

.avatar img,
.avatar div {
    border-radius: 30px;
}

.avatar-letter {
    color: #fff;
    line-height: 48px;
    width: 48px;
    font-size: 25px;
    text-align: center;
}