text-align: left|right|center|justify|initial|inherit;
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div { width: 300px; border: 1px solid brown; }
div:nth-of-type(1) { text-align:left; }
div:nth-of-type(2) { text-align:right; }
div:nth-of-type(3) { text-align:center; }
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<div>S4 그룹: 12-크라운-4, tetrabromoneopentane<br>S6 그룹: 18-크라운-6, bis(9-ane-S3)copper(II)</div>
<div>S4 그룹: 12-크라운-4, tetrabromoneopentane<br>S6 그룹: 18-크라운-6, bis(9-ane-S3)copper(II)</div>
<div>S4 그룹: 12-크라운-4, tetrabromoneopentane<br>S6 그룹: 18-크라운-6, bis(9-ane-S3)copper(II)</div>
<div>S4 그룹: 12-크라운-4, tetrabromoneopentane<br>S6 그룹: 18-크라운-6, bis(9-ane-S3)copper(II)</div>