.webp-tool{
    max-width:540px;
    margin:20px auto;
    padding:15px;
    border:1px solid #ddd;
    text-align:center;
}
.webp-tool img{max-width:100%;margin-top:10px;}
button{padding:10px 20px;margin-top:10px;cursor:pointer;}
progress{width:100%;margin:15px 0;}