.bordered {
    position: relative;
    height: 75px;
    width: 100%;
    border-top: 40px solid lightblue;
    background: #FFF;
    padding-top: 10px;
}

.bordered:before {
    position: absolute;
    content: '';
    top: 0px;
    height: 8px;
    width: 100%;
    background-size: 12px 12px;
    background-position: -5px -3px;
    background-image: -webkit-radial-gradient(50% 0%, circle, lightblue 50%, transparent 55%);
    background-image: -moz-radial-gradient(50% 0%, circle, lightblue 50%, transparent 55%);
    background-image: radial-gradient(circle at 50% 0%, lightblue 50%, transparent 55%);
}