.user_circle_green,
.user_circle_orange,
.user_circle_empty,
.user_circle_empty_line,
.user_circle_fraction {
    border-radius: 50%;
    border: 1px solid;
    float: left;
    position: relative;
    top: 5px;
}

.user_circle_green {
    background-color: hsl(106, 74%, 44%);
}

.user_circle_green,
.user_circle_fraction {
    border-color: hsl(106, 74%, 44%);
}

.user_circle_orange {
    border-color: hsl(29, 84%, 51%);
    background-color: hsl(29, 84%, 51%);

    background: -moz-linear-gradient(top, hsla(0, 0%, 100%, 0.0) 50%, hsla(29, 84%, 51%, 1.0) 50%); /* FF3.6+ */
    background: -webkit-gradient(linear, left top, left bottom, color-stop(50%, hsla(0, 0%, 100%, 0.0)), color-stop(50%, hsla(29, 84%, 51%, 1.0))); /* Chrome,Safari4+ */
    background: -webkit-linear-gradient(top, hsla(0, 0%, 100%, 0.0) 50%, hsla(29, 84%, 51%, 1.0) 50%); /* Chrome10+,Safari5.1+ */
    background: -o-linear-gradient(top, hsla(0, 0%, 100%, 0.0) 50%, hsla(29, 84%, 51%, 1.0) 50%); /* Opera 11.10+ */
    background: -ms-linear-gradient(top, hsla(0, 0%, 100%, 0.0) 50%, hsla(29, 84%, 51%, 1.0) 50%); /* IE10+ */
    background: linear-gradient(to bottom, hsla(0, 0%, 100%, 0.0) 50%, hsla(29, 84%, 51%, 1.0) 50%); /* W3C */
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffffff', endColorstr='#ec7e18', GradientType=0 ); /* IE6-9; filters only work with hex colors */
}

.user_circle_empty {
    background-color: none;
    border-color: hsl(0, 0%, 50%);
}

.user_circle_empty_line {
    border-color: hsl(0, 0%, 50%);

    &::after {
        content: '';
        background: hsl(0, 0%, 50%);
        height: 1.5px; // 1px is too thin, 2px is too thick
        width: 6px;
        display: block;
        margin: 3.25px auto 0 auto; // (total height - line height) / 2 = 3.25px
    }
}