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.circle-text {
    width:50%;
}
.circle-text:after {
    content: "";
    display: block;
    width: 100%;
    height:0;
    padding-bottom: 100%;
    background: #4679BD; 
    -moz-border-radius: 50%; 
    -webkit-border-radius: 50%; 
    border-radius: 50%;
}
.circle-text div {
    float:left;
    width:100%;
    padding-top:50%;
    line-height:1em;
    margin-top:-0.5em;
    text-align:center;
    color:white;
}

<div class="circle-text"><div>I'm a Circle!</div></div>