div css字间距

div:nth-child(1){
color: #FFFFFF;
font-size: 13px;
font-weight: bold;
margin-bottom: 25px;
letter-spacing:1px;//字间距调节
}
div:nth-child(2),div:nth-child(3),div:nth-child(4){
color: #FFFFFF;
font-size: 11px;
margin-bottom: 14px;
}
div:nth-child(4){
float: left;
}
div:nth-child(5){
float: right;
}