<div class="floating-group">
  <input type="text" id="username" class="floating-input" placeholder=" " required>
  <label for="username" class="floating-label">Username</label>
</div>
<div class="floating-group">
  <input type="password" id="userpass" class="floating-input" placeholder=" " required>
  <label for="userpass" class="floating-label">Password</label>
</div>

.floating-group {
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  position: relative;
  margin-bottom: 20px;
  width: 100%;
  max-width: 300px;
}
.floating-input {
  width: 100%;
  padding: 12px 10px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  outline: none;
  font-size: 1rem;
  transition: border-color 0.2s;
  background: transparent;
  color: #1f2937;
}
.floating-input:focus {
  border-color: #3b82f6;
}
.floating-label {
  position: absolute;
  top: 12px;
  left: 10px;
  font-size: 1rem;
  color: #9ca3af;
  pointer-events: none;
  transition: 0.2s ease all;
  background: #fff;
  padding: 0 4px;
}
.floating-input:focus ~ .floating-label,
.floating-input:not(:placeholder-shown) ~ .floating-label {
  top: -10px;
  left: 8px;
  font-size: 0.75rem;
  color: #3b82f6;
  font-weight: 600;
}