<form class="hs-form stacked">
    <fieldset class="form-columns-2">
        <div class="field hs-form-field">
            <label>First Name</label>
            <div class="input">
                <input class="hs-input left" type="text" />
            </div>
        </div>
        <div class="field hs-form-field">
            <label>Last Name</label>
            <div class="input">
                <input class="hs-input right" type="text" />
            </div>
        </div>
    </fieldset>

    <div class="field hs-form-field">
        <label>Company</label>
        <div class="input">
            <input class="hs-input" type="text" />
        </div>
    </div>
    <div class="field hs-form-field">
        <label>Email</label>
        <div class="input">
            <input class="hs-input" type="email" />
        </div>
    </div>
    <a class="hs-button large primary" href="#">Start Today!</a>
</form>

@import url("https://fonts.googleapis.com/css2?family=Montserrat:wght@400;700&display=swap");

body {
    font-family: "Montserrat", sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 2rem;
}

.hs-form {
    width: 100%;
    max-width: 500px;
    margin: 4rem auto;
}

fieldset {
    border: 0;
    padding: 0;
    margin: 0;
    max-width: 500px;
}

fieldset.form-columns-2 .hs-form-field {
    width: 50%;
    float: left;
}

.hs-form-field {
    line-height: 1.5;
    margin: 0 0 1.5rem;
    position: relative;
}

.hs-form-field .form-columns-2 {
    line-height: 1.5;
    margin: 0 0 1.5rem;
    position: relative;
}

.hs-form-field label {
    color: gray;
    display: block;
    position: absolute;
    left: 1rem;
    top: 1rem;
    transform: translate(0, 0) scale(1);
    transform-origin: bottom left;
    transition: all 200ms ease;
}
.hs-form-field.active label {
    transform: scale(0.75);
    color: #a867eb;
    background: white;
    padding: 0 0.25rem;
    top: -0.9rem;
    left: 1rem;
    z-index: 5;
}
.hs-input {
    width: 100%;
    border: 0px none;
    border-radius: 0.5rem;
    border: 1px solid #767676;
    color: #555;
    padding: 1.1rem 1.25rem;
    -webkit-appearance: none;
    font-size: 1rem;
    background: transparent;
    position: relative;
    box-sizing: border-box;
}

.hs-input.left {
    border-radius: 0.5rem 0 0 0.5rem;
    border-width: 1px 0 1px 1px;
}

.hs-input.right {
    border-radius: 0 0.5rem 0.5rem 0;
}

.hs-input:focus {
    outline: 0 none;
    border-color: #a867eb;
}
.hs-input:invalid {
    border-color: red;
}
.hs-button {
    margin-top: 20px;
    padding: 1.25rem 2.5rem;
    display: inline-block;
    background-color: #a867eb;
    color: white;
    text-decoration: none;
    text-align: center;
    font-weight: 700;
    box-shadow: 4px 5px 0 0 rgb(22 49 86 / 10%);
}
.hs-button:hover,
.hs-button:focus {
    background-color: #ea67eb;
    color: white;
    text-decoration: none;
    outline: 0 none;
}

/* animation push for submit buttons */
@keyframes animation-push {
    50% {
        transform: scale(0.85);
    }
    100% {
        transform: scale(1);
    }
}
.hs-button:active,
.hs-button:focus,
.hs-button:hover {
    animation-name: animation-push;
    animation-duration: 0.3s;
    animation-timing-function: linear;
    animation-iteration-count: 1;
}

var $input = $(".hs-input");

// move label on input focus
$input
  .on("focus", function() {
    $(this)
      .parent()
      .parent()
      .addClass("active");
  })
  .blur();

// move label if input is empty or not
$input
  .focusout(function() {
    if (!$(this).val()) {
      $(this)
        .parent()
        .parent()
        .removeClass("active");
    } else {
      $(this)
        .parent()
        .parent()
        .addClass("active");
    }
  })
  .focusout(); // focusout event for prefilled forms

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js