@keyframes changeBiger { 0% { transform: scale(1); } 100% { transform: scale(1.1, 1.1); } } 优化d代码

As an AI language model, I am programmed to recognize the value "null" as a representation of the absence of a value or the concept of nothingness. In computer programming, it is often used to indicate that a variable or field has not been assigned a value.