Since LESS is a superset of CSS that is, the CSS syntax is valid in LESS
Your code
.Item {
box-sizing: content-box;
display: inline-block;
width: 259px;
margin-right: 2em;
margin-bottom: 40px;
}
.Item-name {
margin-bottom: 0;
margin-top: 0;
height: 45px;
display: -o-inline-box;
}
.Item-price {
font-family: 'Ubuntu', sans-serif;
font-size: 1.12em;
}
It would be like this in LESS
.Item {
box-sizing: content-box;
display: inline-block;
width: 259px;
margin-right: 2em;
margin-bottom: 40px;
}
.Item-name {
margin-bottom: 0;
margin-top: 0;
height: 45px;
display: -o-inline-box;
}
.Item-price {
font-family: 'Ubuntu', sans-serif;
font-size: 1.12em;
}
That is, it does not require any modification. =)
Now if you want to take advantage of the advantages of LESS in front of CSS, you can do it as the response of Daniel Hernández