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HTML

CSS

:root {
  --valid: hsl(140 80% 40%);
  --invalid: hsl(10 80% 40%);
  --input: hsl(0 0% 0%);
}
body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 100;
  background-color: hsl(0 0% 6%);
  color: hsl(0 0% 98%);
}
.form-group {
  --active: 0;
  container-type: inline-size;
  flex: 1;
}

form {
  width: 40ch;
}
input {
  --is-valid: 0;
  --is-invalid: 0;
  background: linear-gradient(var(--input), var(--input)) padding-box,
    linear-gradient(var(--invalid), var(--invalid))
      calc((1 - var(--is-invalid)) * -100cqi) 0 / 100% 100% border-box,
    linear-gradient(var(--valid), var(--valid))
      calc((1 - var(--is-valid)) * 100cqi) 0 / 100% 100% border-box,
    var(--input);
  border: 2px solid transparent;
  font-size: 1rem;
  background-repeat: no-repeat;
  max-width: 100%;
  font-family: "Geist Sans", "SF Pro", sans-serif;
  font-weight: 40;
  background-color: #3b4148;
  border-radius: 10px;
  color: #a9a9a9;
  margin-bottom: 1em;
  padding: 0 16px;
  width: 100%;
  outline: 0;
  height: 50px;
}

label {
  margin-bottom: 0.5rem;
  display: inline-block;
  padding-left: 5px;
  opacity: calc(var(--active) + 0.45);
  transition: opacity 0.5s;
}

.form-group:focus-within {
  --active: 1;
}

input:invalid:not(:placeholder-shown):not(:focus-visible) {
  --is-invalid: 1;
}

input:valid {
  --is-valid: 1;
}
@media (prefers-reduced-motion: no-preference) {
  input {
    transition: background-position 0.5s;
  }
}
.submitbtn {
  background: #2a292c;
  border: 0;
  margin-top: 0.5rem;
  width: 100%;
  height: 45px;
  border-radius: 10px;
  color: white;
  cursor: pointer;
  transition: background 0.3s ease-in-out;
}
.submitbtn:hover {
  background: #404949;
}
h1{
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.5rem;
  font-weight: 400;
  font-size: 30px;
  color: #a9a9a9;
}