CodePen Embed - Form fields with material design and video background, in pure CSS

<!-- Taken from https://codepen.io/jonnitto/project/editor/XRPjxx -->
<video width="1280" height="720" class="background" autoplay muted loop>
  <source src="https://codepen.jonnitto.ch/BackgroundVideo.mp4" type="video/mp4">
</video>
<form class="form-card">
    <fieldset class="form-fieldset">
        <legend class="form-legend">Material Design Formular</legend>
        <div class="form-radio form-radio-inline">
            <div class="form-radio-legend">Prefered Pronoun</div>
            <label class="form-radio-label">
                <input name=pronoun class="form-radio-field" type="radio" required value="He" />
                <i class="form-radio-button"></i>
                <span>He</span>
            </label>
            <label class="form-radio-label">
                <input name=pronoun class="form-radio-field" type="radio" required value="She" />
                <i class="form-radio-button"></i>
                <span>She</span>
            </label>
            <label class="form-radio-label">
                <input name=pronoun class="form-radio-field" type="radio" required value="They" />
                <i class="form-radio-button"></i>
                <span>They</span>
            </label>
            <label class="form-radio-label">
                <input name=pronoun class="form-radio-field" type="radio" required value="Ze" />
                <i class="form-radio-button"></i>
                <span>Ze</span>
            </label>
            <label class="form-radio-label">
                <input name=pronoun class="form-radio-field" type="radio" required value="A pronoun not listed" />
                <i class="form-radio-button"></i>
                <span>A pronoun not listed</span>
            </label>
            <label class="form-radio-label">
                <input name=pronoun class="form-radio-field" type="radio" required value="No pronoun preference" />
                <i class="form-radio-button"></i>
                <span>No pronoun preference</span>
            </label>
            <small class="form-element-hint">Feel free to choose</small>
        </div>
        <div class="form-element form-input">
            <input id="field-omv6eo-metm0n-5j55wv-w3wbws-6nm2b9" class="form-element-field" placeholder="Please fill in your full name" type="input" required/>
            <div class="form-element-bar"></div>
            <label class="form-element-label" for="field-omv6eo-metm0n-5j55wv-w3wbws-6nm2b9">Name</label>
        </div>
        <div class="form-element form-input form-has-error">
            <input id="field-x98ezh-s6s2g8-vfrkgb-ngrhef-atfkop" class="form-element-field -hasvalue" placeholder=" " type="number" required value="13" />
            <div class="form-element-bar"></div>
            <label class="form-element-label" for="field-x98ezh-s6s2g8-vfrkgb-ngrhef-atfkop">Your age</label>
            <small class="form-element-hint">You are way to young, sorry</small>
        </div>
        <div class="form-element form-input">
            <input id="field-uyzeji-352rnc-4rv3g1-bvlh88-9dewuz" class="form-element-field" placeholder=" " type="email" required/>
            <div class="form-element-bar"></div>
            <label class="form-element-label" for="field-uyzeji-352rnc-4rv3g1-bvlh88-9dewuz">Email</label>
            <small class="form-element-hint">We will never spam you!</small>
        </div>
        <div class="form-checkbox form-checkbox-inline">
            <div class="form-checkbox-legend">Which type of music do you like?</div>
            <label class="form-checkbox-label">
                <input name=rap class="form-checkbox-field" type="checkbox" />
                <i class="form-checkbox-button"></i>
                <span>Rap</span>
            </label>
            <label class="form-checkbox-label">
                <input name=pop class="form-checkbox-field" type="checkbox" />
                <i class="form-checkbox-button"></i>
                <span>Pop</span>
            </label>
            <label class="form-checkbox-label">
                <input name=rock class="form-checkbox-field" type="checkbox" />
                <i class="form-checkbox-button"></i>
                <span>Rock</span>
            </label>
            <label class="form-checkbox-label">
                <input name=metal class="form-checkbox-field" type="checkbox" />
                <i class="form-checkbox-button"></i>
                <span>Metal</span>
            </label>
            <label class="form-checkbox-label">
                <input name=r_b class="form-checkbox-field" type="checkbox" />
                <i class="form-checkbox-button"></i>
                <span>R&amp;B</span>
            </label>
        </div>
        <div class="form-element form-select">
            <select id="field-be1h8i-ll2hpg-q4efzm-nfjj1e-udkw5r" class="form-element-field">
                <option disabled selected value="" class="form-select-placeholder"></option>
                <option value="Rap">Rap</option>
                <option value="Pop">Pop</option>
                <option value="Rock">Rock</option>
                <option value="Metal">Metal</option>
                <option value="R&amp;B">R&amp;B</option>
            </select>
            <div class="form-element-bar"></div>
            <label class="form-element-label" for="field-be1h8i-ll2hpg-q4efzm-nfjj1e-udkw5r">Select your favorite music genre</label>
        </div>
        <div class="form-radio form-radio-block">
            <div class="form-radio-legend">I prefer…</div>
            <label class="form-radio-label">
                <input name=eat class="form-radio-field" type="radio" value="vagatarian food" />
                <i class="form-radio-button"></i>
                <span>vagatarian food</span>
            </label>
            <label class="form-radio-label">
                <input name=eat class="form-radio-field" type="radio" value="vegan food" />
                <i class="form-radio-button"></i>
                <span>vegan food</span>
            </label>
            <label class="form-radio-label">
                <input name=eat class="form-radio-field" type="radio" value="food with fish" />
                <i class="form-radio-button"></i>
                <span>food with fish</span>
            </label>
            <label class="form-radio-label">
                <input name=eat class="form-radio-field" type="radio" value="food with meat" />
                <i class="form-radio-button"></i>
                <span>food with meat</span>
            </label>
        </div>
        <div class="form-element form-textarea">
            <textarea id="field-3naeph-0f3yuw-x153ph-dzmahy-qhkmgm" class="form-element-field" placeholder=" "></textarea>
            <div class="form-element-bar"></div>
            <label class="form-element-label" for="field-3naeph-0f3yuw-x153ph-dzmahy-qhkmgm">Your Message</label>

        </div>
    </fieldset>
    <div class="form-actions">
        <button class="form-btn" type="submit">Send inquiry</button>
        <button class="form-btn-cancel -nooutline" type="reset">Cancel</button>
    </div>
</form>

// Taken from https://codepen.io/jonnitto/project/editor/XRPjxx

.background {
  position: fixed;
  z-index: -1;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  object-fit: cover;
  height: 100%;
  width: 100%;
}

.form-btn,
.form-btn-cancel,
.form-btn-error {
  background: transparent;
  font-size: 1rem;
  color: #fff;
  cursor: pointer;
  border: 1px solid transparent;
  padding: 5px 24px;
  margin-top: 2.25rem;
  position: relative;
  z-index: 0;
  transition: transform 0.28s ease;
  will-change: transform;
}

.form-btn::before,
.form-btn::after,
.form-btn-cancel::before,
.form-btn-cancel::after,
.form-btn-error::before,
.form-btn-error::after {
  position: absolute;
  content: "";
  top: -1px;
  left: -1px;
  right: -1px;
  bottom: -1px;
}

.form-btn::before,
.form-btn-cancel::before,
.form-btn-error::before {
  background: #337ab7;
  z-index: -2;
}

.form-btn::after,
.form-btn-cancel::after,
.form-btn-error::after {
  background: #000;
  z-index: -1;
  opacity: 0;
  transition: opacity 0.28s ease;
  will-change: opacity;
}

.form-btn:focus,
.form-btn-cancel:focus,
.form-btn-error:focus {
  outline: none;
}

.form-btn:focus::after,
.form-btn:hover::after,
.form-btn-cancel:focus::after,
.form-btn-cancel:hover::after,
.form-btn-error:focus::after,
.form-btn-error:hover::after {
  opacity: 0.3;
}

.form-btn:active,
.form-btn-cancel:active,
.form-btn-error:active {
  transform: translateY(1px);
}

.form-btn-error::before {
  background: #d9534f;
}

.form-btn-cancel {
  transition: color 0.28s ease, transform 0.28s ease;
  color: #b52b27;
  border-color: currentColor;
  will-change: color, transform;
}

.form-btn-cancel.-nooutline {
  border-color: transparent;
}

.form-btn-cancel::before {
  background: #b52b27;
  opacity: 0;
  transition: opacity 0.28s ease;
  will-change: opacity;
}

.form-btn-cancel::after {
  display: none;
}

.form-btn-cancel:focus,
.form-btn-cancel:hover {
  color: #fff;
}

.form-btn-cancel:focus::before,
.form-btn-cancel:hover::before {
  opacity: 1;
}

.form-btn-block {
  display: block;
  width: 100%;
  padding: 5px;
}

.form-checkbox,
.form-radio {
  position: relative;
  margin-top: 2.25rem;
  margin-bottom: 2.25rem;
  text-align: left;
}

.form-checkbox-inline .form-checkbox-label,
.form-radio-inline .form-radio-label {
  display: inline-block;
  margin-right: 1rem;
}

.form-checkbox-legend,
.form-radio-legend {
  margin: 0 0 0.125rem 0;
  font-weight: 500;
  font-size: 1rem;
  color: #333;
}

.form-checkbox-label,
.form-radio-label {
  position: relative;
  cursor: pointer;
  padding-left: 1.5rem;
  text-align: left;
  color: #333;
  display: block;
  margin-bottom: 0.5rem;
}

.form-checkbox-label:hover i,
.form-radio-label:hover i {
  color: #337ab7;
}

.form-checkbox-label span,
.form-radio-label span {
  display: block;
}

.form-checkbox-label input,
.form-radio-label input {
  width: auto;
  opacity: 0.0001;
  position: absolute;
  left: 0.25rem;
  top: 0.25rem;
  margin: 0;
  padding: 0;
}

.form-checkbox-button {
  position: absolute;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  display: block;
  color: #999;
  left: 0;
  top: 0.25rem;
  width: 1rem;
  height: 1rem;
  z-index: 0;
  border: 0.125rem solid currentColor;
  border-radius: 0.0625rem;
  transition: color 0.28s ease;
  will-change: color;
}

.form-checkbox-button::before,
.form-checkbox-button::after {
  position: absolute;
  height: 0;
  width: 0.2rem;
  background-color: #337ab7;
  display: block;
  transform-origin: left top;
  border-radius: 0.25rem;
  content: "";
  transition: opacity 0.28s ease, height 0s linear 0.28s;
  opacity: 0;
  will-change: opacity, height;
}

.form-checkbox-button::before {
  top: 0.65rem;
  left: 0.38rem;
  transform: rotate(-135deg);
  box-shadow: 0 0 0 0.0625rem #fff;
}

.form-checkbox-button::after {
  top: 0.3rem;
  left: 0;
  transform: rotate(-45deg);
}

.form-checkbox-field:checked ~ .form-checkbox-button {
  color: #337ab7;
}

.form-checkbox-field:checked ~ .form-checkbox-button::after,
.form-checkbox-field:checked ~ .form-checkbox-button::before {
  opacity: 1;
  transition: height 0.28s ease;
}

.form-checkbox-field:checked ~ .form-checkbox-button::after {
  height: 0.5rem;
}

.form-checkbox-field:checked ~ .form-checkbox-button::before {
  height: 1.2rem;
  transition-delay: 0.28s;
}

.form-radio-button {
  position: absolute;
  left: 0;
  cursor: pointer;
  display: block;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  color: #999;
}

.form-radio-button::before,
.form-radio-button::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  margin: 0.25rem;
  width: 1rem;
  height: 1rem;
  transition: transform 0.28s ease, color 0.28s ease;
  border-radius: 50%;
  border: 0.125rem solid currentColor;
  will-change: transform, color;
}

.form-radio-button::after {
  transform: scale(0);
  background-color: #337ab7;
  border-color: #337ab7;
}

.form-radio-field:checked ~ .form-radio-button::after {
  transform: scale(0.5);
}

.form-radio-field:checked ~ .form-radio-button::before {
  color: #337ab7;
}

.form-has-error .form-checkbox-button,
.form-has-error .form-radio-button {
  color: #d9534f;
}

.form-card {
  border-radius: 2px;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
  transition: all 0.56s cubic-bezier(0.25, 0.8, 0.25, 1);
  max-width: 500px;
  padding: 0;
  margin: 50px auto;
}

.form-card:hover,
.form-card:focus {
  box-shadow: 0 14px 28px rgba(0, 0, 0, 0.25), 0 10px 10px rgba(0, 0, 0, 0.22);
}

.form-card:focus-within {
  box-shadow: 0 14px 28px rgba(0, 0, 0, 0.25), 0 10px 10px rgba(0, 0, 0, 0.22);
}

.form-actions {
  position: relative;
  display: -ms-flexbox;
  display: flex;
  margin-top: 2.25rem;
}

.form-actions .form-btn-cancel {
  -ms-flex-order: -1;
  order: -1;
}

.form-actions::before {
  content: "";
  position: absolute;
  width: 100%;
  height: 1px;
  background: #999;
  opacity: 0.3;
}

.form-actions > * {
  -ms-flex: 1;
  flex: 1;
  margin-top: 0;
}

.form-fieldset {
  padding: 30px;
  border: 0;
}

.form-fieldset + .form-fieldset {
  margin-top: 15px;
}

.form-legend {
  padding: 1em 0 0;
  margin: 0 0 -0.5em;
  font-size: 1.5rem;
  text-align: center;
}

.form-legend + p {
  margin-top: 1rem;
}

.form-element {
  position: relative;
  margin-top: 2.25rem;
  margin-bottom: 2.25rem;
}

.form-element-hint {
  font-weight: 400;
  font-size: 0.6875rem;
  color: #a6a6a6;
  display: block;
}

.form-element-bar {
  position: relative;
  height: 1px;
  background: #999;
  display: block;
}

.form-element-bar::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: #337ab7;
  height: 2px;
  display: block;
  transform: rotateY(90deg);
  transition: transform 0.28s ease;
  will-change: transform;
}

.form-element-label {
  position: absolute;
  top: 0.75rem;
  line-height: 1.5rem;
  pointer-events: none;
  padding-left: 0.125rem;
  z-index: 1;
  font-size: 1rem;
  font-weight: normal;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin: 0;
  color: #a6a6a6;
  transform: translateY(-50%);
  transform-origin: left center;
  transition: transform 0.28s ease, color 0.28s linear, opacity 0.28s linear;
  will-change: transform, color, opacity;
}

.form-element-field {
  outline: none;
  height: 1.5rem;
  display: block;
  background: none;
  padding: 0.125rem 0.125rem 0.0625rem;
  font-size: 1rem;
  border: 0 solid transparent;
  line-height: 1.5;
  width: 100%;
  color: #333;
  box-shadow: none;
  opacity: 0.001;
  transition: opacity 0.28s ease;
  will-change: opacity;
}

.form-element-field:-ms-input-placeholder {
  color: #a6a6a6;
  transform: scale(0.9);
  transform-origin: left top;
}

.form-element-field::placeholder {
  color: #a6a6a6;
  transform: scale(0.9);
  transform-origin: left top;
}

.form-element-field:focus ~ .form-element-bar::after {
  transform: rotateY(0deg);
}

.form-element-field:focus ~ .form-element-label {
  color: #337ab7;
}

.form-element-field.-hasvalue,
.form-element-field:focus {
  opacity: 1;
}

.form-element-field.-hasvalue ~ .form-element-label,
.form-element-field:focus ~ .form-element-label {
  transform: translateY(-100%) translateY(-0.5em) translateY(-2px) scale(0.9);
  cursor: pointer;
  pointer-events: auto;
}

.form-has-error .form-element-label.form-element-label,
.form-has-error .form-element-hint {
  color: #d9534f;
}

.form-has-error .form-element-bar,
.form-has-error .form-element-bar::after {
  background: #d9534f;
}

.form-is-success .form-element-label.form-element-label,
.form-is-success .form-element-hint {
  color: #259337;
}

.form-is-success .form-element-bar::after {
  background: #259337;
}

input.form-element-field:not(:placeholder-shown),
textarea.form-element-field:not(:placeholder-shown) {
  opacity: 1;
}

input.form-element-field:not(:placeholder-shown) ~ .form-element-label,
textarea.form-element-field:not(:placeholder-shown) ~ .form-element-label {
  transform: translateY(-100%) translateY(-0.5em) translateY(-2px) scale(0.9);
  cursor: pointer;
  pointer-events: auto;
}

textarea.form-element-field {
  height: auto;
  min-height: 3rem;
}

select.form-element-field {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  cursor: pointer;
}

.form-select-placeholder {
  color: #a6a6a6;
  display: none;
}

.form-select .form-element-bar::before {
  content: "";
  position: absolute;
  height: 0.5em;
  width: 0.5em;
  border-bottom: 1px solid #999;
  border-right: 1px solid #999;
  display: block;
  right: 0.5em;
  bottom: 0;
  transition: transform 0.28s ease;
  transform: translateY(-100%) rotateX(0deg) rotate(45deg);
  will-change: transform;
}

.form-select select:focus ~ .form-element-bar::before {
  transform: translateY(-50%) rotateX(180deg) rotate(45deg);
}

.form-element-field[type="number"] {
  -moz-appearance: textfield;
}

.form-element-field[type="number"]::-webkit-outer-spin-button,
.form-element-field[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

body {
  margin: 40px auto;
  background-image: linear-gradient(to top, #a3bded 0%, #6991c7 100%);
}

View Compiled

// Taken from https://codepen.io/jonnitto/project/editor/XRPjxx

// Minimal Javascript (for Edge, IE and select box)
document.addEventListener("change", function(event) {
  let element = event.target;
  if (element && element.matches(".form-element-field")) {
    element.classList[element.value ? "add" : "remove"]("-hasvalue");
  }
});

This Pen is owned by Jon Uhlmann on CodePen.

See more by @jonnitto on CodePen

External CSS

https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0/css/bootstrap-reboot.min.css

External JavaScript

This Pen doesn't use any external JavaScript resources.