The source code is as follows:
<!DOCTYPE html> <html Lang="en"> <head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible"content="edge"><title>Rtssts Web</title> </head><body> <section> <span></span><span></span><span></span><span></span><span></span><span></span><span></span>< span></span><span></span><span></span><span></span><span></span><span></span><span></span><span ></span><span></span><span></span><span></span><span></span><span></span><span></span><span> </span><span></span><span></span><span></span><span></span><span></span><span></span><span>< /span><span></span><span></span><span></span><span></span><span></span><span></span><span></ span><span></span><span></span><span></span><span></span><span></span><span></span><span></span ><span></span><span></span><span></span><span></span><span></span><span></span><span></span> <span></span><span></span><span></span><span></span><span></span><span></span><span></span>< span></span><span></span><span></span><span></span><span></span><span></span><span></span><span ></span><span></span><span></span><span></span><span></span><span></span><span></span><span> </span><span></span><span></span><span></span><span></span><span></span><span></span><span>< /span><span></span><span></span><span></span><span></span><span></span><span></span><span></ span><span></span><span></span><span></span><span></span><span></span><span></span><span></span ><span></span><span></span><span></span><span></span><span></span><span></span><span></span> <span></span><span></span><span></span><span></span><span></span><span></span><span></span>< span></span><span></span><span></span><span></span><span></span><span></span><span></span><span ></span><span></span><span></span><span></span><span></span><span></span><span></span><span> </span><span></span><span></span><span></span><span></span><span></span><span></span><span>< /span><span></span><span></span><span></span><span></span><span></span><span></span><span></ span><span></span><span></span><span></span><span></span><span></span><span></span><span></span ><span></span><span></span><span></span><span></span><span></span><span></span><span></span> <span></span><span></span><span></span><span></span><span></span><span></span><span></span>< span></span><span></span><span></span><span></span><span></span><span></span><span></span><span ></span><span></span><span></span><span></span><span></span><span></span><span></span><span> </span><span></span><span></span><span></span><span></span><span></span><span></span><span>< /span><span></span><span></span><span></span><span></span><span></span><span></span><span></ span><span></span><span></span><span></span><span></span><span></span><span></span><span></span ><span></span><span></span><span></span><span></span><span></span><span></span><span></span> <span></span><span></span><span></span><span></span><span></span><span></span><span></span>< span></span><span></span><span></span><span></span><span></span><span></span><span></span><span ></span><span></span><span></span><span></span><span></span><span></span><span></span><span> </span><span></span><span></span><span></span><span></span><span></span><span></span><span>< /span><span></span><span></span><span></span><span></span><span></span><span></span><span></ span><span></span><span></span><span></span><span></span><span></span><span></span><span></span ><span></span><span></span><span></span><span></span><span></span><span></span><span></span> <span></span><span></span><span></span><span></span><span></span><span></span> <div class="Rtssignin"> <div class="RtsContent"><h2>SIGN IN</h2> <div class="Rtsform"> <div class="InputRt"> <input type="text"required><i>Uesrname</i> </div><div class="InputRt"> <input type="password"required><i>Passwword</i> </div><div class="Rtslinks"> <a href="#">Forgot Password</a> <a href="#">Signup</a> </div><div class="InputRt"> <input type="submit"value="Login"> </div> </div><div> <style>*{ margin:0; padding:0; box-sizing:border-box; font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif; }body{ display:flex; justify-content:center; align-items:center; min-height:100vh; background:#000; }section{ position:absolute; width:100vw; height:100vh; display:flex; justify-content:center; align-items:center; gap:2px; flex-wrap:wrap; }section::before{ content:''; position:absolute; width:100%; height:100%; background:linear-gradient(#000,#0f0,#000); animation:RtsAnim 5.9s linear infinite; }@keyframes RtsAnim{ 0%{ transform:translateY(-100%); }100%{ transform:translateY(100%); } }section span{ position:relative; display:block; width:calc(6.25vw - 2px); height:calc(6.25vw - 2px); background:#181818; z-index:2; transition:1.59s; }section span:hover{ background:#0f0; transition:0s; }section .Rtssignin{ position:absolute; width:400px; background:#222; z-index:1000; display:flex; justify-content:center; align-items:center; padding:40px; border-radius:5px; box-shadow:0 15px 35px rgba(0,0,0,0.5); }section .Rtssignin .RtsContent{ position:relative; width:100%; display:flex; justify-content:center; align-items:center; flex-direction:column; gap:39px; }section .Rtssignin .RtsContent h2{ font-size:2em; color:#0f0; text-transform:uppercase; }section .Rtssignin .RtsContent .Rtsform{ width:100%; display:flex; flex-direction:column; gap:24px; }section .Rtssignin .RtsContent .Rtsform .InputRt{ position:relative; width:99%; }section .Rtssignin .RtsContent .Rtsform .InputRt input{ position:relative; width:99%; background:#333; border:none; outline:none; padding:24px 9px 7.2px; border-radius:5px; color:#fff; font-weight:500; font-size:1em; }section .Rtssignin .RtsContent .Rtsform .InputRt i{ position:absolute; left:0; padding:15px 10px; font-style:bold; color:#aaa; transition:0.59s; pointer-events:none; }section .Rtssignin .RtsContent .Rtsform .InputRt input:focus~i,section .Rtssignin .RtsContent .Rtsform .InputRt input:valid~i{ transform:translateY(-7.9px); font-size:0.79em; color:#fff; }.Rtssignin .RtsContent .Rtsform .Rtslinks{ position:relative; width:100%; display:flex; justify-content:space-between; }.Rtssignin .RtsContent .Rtsform .Rtslinks a{ color:#fff; text-decoration:none; }.Rtssignin .RtsContent .Rtsform .Rtslinks a:nth-child(2){ color:#0f0; font-weight:600; }.Rtssignin .RtsContent .Rtsform .InputRt input[type="submit"]{ padding:10px; background:#0f0; color:#000; font-weight:600; font-size:1.24em; letter-spacing:0.05em; cursor:pointer; }@media(max-width:900px){ section span{ width:calc(10vw - 2px); height:calc(10vw - 2px); } }@media(max-width:600px){ section span{ width:calc(20vw - 2px); height:calc(20vw - 2px); } }</style> </div> </section> </body> </html>
Demonstration effect: