#float
Pushes the element to either the left or right side. The following siblings will wrap around the floating element
默认属性
float: none;
Removes any previously defined float value. The element will remain in the natural flow of the page.
float: left;
Moves the element to the left side of its container. The following elements will wrap around it and fill the space remaining on the right.
float: right;
Moves the element to the right side of its container. The following elements will wrap around it and fill the space remaining on the left.