html,body{margin:0;padding:0;height:100%}*,*:before,*:after{box-sizing:border-box}.app-container{display:flex;flex-direction:column;align-items:center;justify-content:center;font-style:normal;width:100%;height:100%;background:linear-gradient(180deg,#665d80,#3e384d);min-height:100vh}.header{text-align:center;margin-bottom:15px;animation:fadeIn .8s ease-in-out}.header h1{font-size:3.5rem;font-family:RocknRoll One,serif;font-weight:700;color:#fff;margin:0}.content{display:flex;flex-direction:column;align-items:center;width:100%;max-width:1700px}.video-player{margin-bottom:5px;text-align:center;animation:fadeIn .9s ease-in-out}.video-info p{font-size:1.7rem;font-family:Noto Sans JP,serif;text-align:center;color:#fff;line-height:1;animation:fadeIn 1s ease-in-out}.bold-info{font-weight:700}.sample-content{text-align:center;margin-top:10px}.sample-content{font-size:1.2rem;font-family:Noto Sans JP,serif;font-optical-sizing:auto;font-weight:400;font-style:normal;color:#fff;line-height:1;animation:fadeIn 1.1s ease-in-out}.white-link{color:#fff;text-decoration:none;font-weight:700}.white-link:hover{text-decoration:underline}