style.css

body {
    font-family: sans-serif;
    padding: 30px;
    background: #ededed;
}

.wrapper {
    max-width: 690px;
    margin: 0 auto;
}

.blue {
    color: #3f7abe;
}

h1 {
    margin: auto;
    margin-top: 50px;
    margin-bottom: 50px;
    color: #08a3d9;
    text-transform: uppercase;
    font-size: 30px;
    color: #000380;
}

#balloon-gallery div {
    background: #ff3300;
    height: 121px;
    width: 119px;
    text-align: center;
    color: #ff3300;
    font-size: 40px;
    font-family: sans-serif, arial;
    border-radius: 100%;
    margin-top: 20px;
    display: inline-block;
    /* float: left; */
    margin: 2.5px 5 px 2.5px 0px;
}

#balloon-gallery div:nth-child(3n) {
    background: #ffce00;
    color: #ffce00;
}

#balloon-gallery div:nth-child(3n-1) {
    background: #00D2FE;
    color: #00D2FE;
}

#balloon-gallery div:nth-child(5n) {
    background: #FF58FF;
    color: #FF58FF;
}

#balloon-gallery div:nth-child(13) {
    background: #FF58FF;
    color: #FF58FF;
}

#balloon-gallery div:nth-child(10n) {
    background: #ff3300;
    color: #ff3300;
}

#balloon-gallery div:nth-child(4n) {
    clear: right;
}

#yay-no-balloons {
    display: none;
    color: #008F86;
    font-size: 100px;
}