移入放大

   .contentBg:hover {
                transform: translateZ(0) scale(1.05);
                transition: all 0.3s ease-in-out;
            }

.contentBg {
                width: 100%;
                height: 100%;
                background-position: center bottom;
                background-size: contain;
                background-repeat: no-repeat;
                cursor: pointer;
            }