Boundary collision happened When margin x/y is zero

[ygj6]

Software version (please complete the following information):

• Browser [e.g. chrom]
• Vue Version [e.g. 2.6.12]
• vue-grid-layout Version: [e.g. master]

Describe the bug Boundary collision happened When margin x is zero and y is also zero

[tangxiaobin17]

The reason for this problem is that use Math.round fn to calculate the width and positon，should to remain one decimal。 const round1 = (v) => Math.round(v * 10) / 10;