CSS Selector starting from nth element.

HTML

<div>
    <span>1</span>
    <span>2</span>
    <span>3</span>
    <span>4</span>
    <span>5</span>
    <span>6</span>
    <span>7</span>
</div>

CSS

div span:nth-child(n+4) {
    background-color: red;
}