如何减去CSS中的宽度？
例如：
width = 100％ – 10px
我不是在说填充或边距。
解决方法
现在
calc的解决方案将是：
width: calc(100% - 10px);
Calc可以使用加法，减法，乘法，除法。
附加说明：
Note: The + and – operators must always be surrounded by whitespace. The operand of calc(50% -8px) for instance will be parsed as a percentage followed by a negative length,an invalid expression,while the operand of calc(50% – 8px) is a percentage followed by a minus sign and a length. Even further,calc(8px + -50%) is treated as a length followed by a plus sign and a negative percentage. The * and / operators do not require whitespace,but adding it for consistency is allowed,and recommended.
