*, *:after, *:before {
    box-sizing: border-box;
}

.graph {
    width: 300px;
    height: 150px;
    position: relative;
    margin: auto;
    text-align: center;
    color: #fff;
    font-size: 22px;
    line-height: 280px;
    font-weight: 600;
    border-radius: 150px 150px 0 0;
    overflow: hidden;
    color: #0ff;
}
.graph:before, .graph:after {
    content: '';
    width: 300px;
    height: 150px;
    border: 50px solid #0ff;
    border-top: none;
    position: absolute;
    -webkit-transition: 0.3s;
    transition: 0.3s;
    -webkit-transform-origin: 50% 0%;
    transform-origin: 50% 0%;
    border-radius: 0 0 300px 300px;
    -webkit-animation: demo 2s;
    animation: demo 2s;
    left: 0;
    top: 100%;
    z-index: 5;
}
.graph:after {
    z-index: 3;
    border-color: rgba(0, 0, 0, 0.15);
    -webkit-transform: rotate(180deg);
    transform: rotate(180deg);
}
.graph:hover:before {
    opacity: .8;
    cursor: pointer;
}
.graph:hover + .tooltip {
    bottom: 105%;
    opacity: 1;
}

.multi-graph {
    width: 300px;
    height: 150px;
    position: relative;
    margin: auto;
    color: #fff;
    font-size: 22px;
    line-height: 280px;
    font-weight: 600;
}
.multi-graph:before {
    content: '';
    width: 300px;
    height: 150px;
    border: 50px solid rgba(0, 0, 0, 0.15);
    border-bottom: none;
    position: absolute;
    -webkit-transform-origin: 50% 0%;
    transform-origin: 50% 0%;
    border-radius: 300px 300px 0 0;
    left: 0;
    top: 0;
}
.multi-graph .graph {
    position: absolute;
    top: 0;
    left: 0;
}
.multi-graph .graph:after {
    background: #eee;
    border: medium none;
    border-radius: 2px;
    color: #333;
    font-weight: 200;
    content: "" attr(data-name) "";
    display: inline-block;
    font-size: 12px;
    height: 20px;
    left: 50%;
    line-height: 20px;
    padding: 0 5px;
    top: 50px;
    z-index: 0;
    -webkit-transform: rotate(0deg) translateX(-50%);
    transform: rotate(0deg) translateX(-50%);
    width: auto;
    opacity: 0;
}
.multi-graph .graph:hover:after {
    opacity: 1;
    top: 70px;
}

section.model-2 .graph {
    color: #2DABD8;
}

section.model-2 .graph:before {
    -webkit-transform: rotate(130deg);
    transform: rotate(130deg);
    border-color: #2DABD8;
}

@-webkit-keyframes demo {
    0% {
        -webkit-transform: rotate(0deg);
        transform: rotate(0deg);
    }
    50% {
        -webkit-transform: rotate(180deg);
        transform: rotate(180deg);
    }
}
@keyframes demo {
    0% {
        -webkit-transform: rotate(0deg);
        transform: rotate(0deg);
    }
    50% {
        -webkit-transform: rotate(180deg);
        transform: rotate(180deg);
    }
}