.content div { opacity: 0; padding: 10px 40px; position: absolute; top: 0; transition: all 0.3s linear 0s; z-index: 1; }
и замените на
.content > div { opacity: 0; padding: 10px 40px; position: absolute; top: 0; transition: all 0.3s linear 0s; z-index: 1; }