img.lazy{opacity:0;transition:opacity 0.3s ease-in-out;background-color:#f0f0f0;min-height:50px;}img.lazy-loaded{opacity:1;}img.lazy::before{content:'';display:block;position:absolute;top:50%;left:50%;width:20px;height:20px;margin:-10px 0 0 -10px;border:2px solid #ddd;border-top-color:#999;border-radius:50%;animation:lazy-spin 0.8s linear infinite;}@keyframes lazy-spin{to{transform:rotate(360deg);}}img.lazy-loaded::before{display:none;}