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CSS

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HTML 

              
                <pre class="output"></pre>
<div class="container">
    <form action="" id="survey-form" class="form" autocomplete="on">
        <h1 id="title">Take this Survey</h1>
        <p id="description" class="underline">
            Thank you for taking the time to improve our service
        </p>
        <div class="form-control">
            <label class="floating" id="name-label" for="name">Name</label>
            <input
                type="text"
                name="name"
                id="name"
                autocomplete="name"
                placeholder="Jane Smith"
                required
            />

            <small></small>
        </div>
        <div class="form-control">
            <label class="floating" id="email-label" for="email">Email</label>
            <input
                type="email"
                autocomplete="email"
                name="email"
                id="email"
                placeholder="[email protected]"
                required
            />

          <small style="visibility: visible;">Error example</small>
        </div>
        <div class="form-control">
            <label class="floating" id="number-label" for="number"
                >Age (optional)</label
            >
            <input
                type="number"
                min="18"
                max="200"
                name="age"
                id="number"
                placeholder="32"
                autocomplete="age"
            />

            <small></small>
        </div>
        <div class="form-control">
            <label for="dropdown" class="underline-left">Choose one:</label>
            <select id="dropdown">
                <option>Rating</option>
                <option>1</option>
                <option>2</option>
                <option>3</option>
                <option>4</option>
                <option>5</option>
            </select>

        </div>
        <div class="form-control custom-inputs">
            <h6 class="underline-left">What food do you like? (select as many as you want)</h6>
            <label
                >Burgers
                <input
                    type="checkbox"
                    checked="checked"
                    value="burgers"
                />
                <span class="checkmark"></span>
            </label>
            <label
                >Vegetables
                <input type="checkbox" value="vegetables" checked="checked" />
                <span class="checkmark"></span>
            </label>

            <label
                >Chickun
                <input type="checkbox" value="chickun" />
                <span class="checkmark"></span>
            </label>

            <label
                >Tacos
                <input type="checkbox" value="tacos" />
                <span class="checkmark"></span>
            </label>

            <label
                >Toast
                <input type="checkbox" value="toast" />
                <span class="checkmark"></span>
            </label>
            <label
                >Pizza
                <input type="checkbox" value="pizza" />
                <span class="checkmark"></span>
            </label>
        </div>
        <div class="form-control custom-inputs">
            <p class="underline-left">Pick a number!</p>
            <label
                >One
                <input type="radio" value="1" name="radio" />
                <span class="checkmark"></span>
            </label>
            <label
                >Two
                <input type="radio" value="2" name="radio" />
                <span class="checkmark"></span>
            </label>
            <label
                >Three
                <input type="radio" value="3" name="radio" />
                <span class="checkmark"></span>
            </label>
            <label
                >Four
                <input type="radio" value="4" name="radio" />
                <span class="checkmark"></span>
            </label>
        </div>
                  <div class="form-control">
                <label class="underline-left" for="comments">Your Comments:</label>
                <textarea
                    name="comments"
                    id="comments"
                    rows="5"
                ></textarea>
            </div>
        <button id="submit" type="submit">Submit</button>
    </form>
</div>

<!-- <script src="https://cdn.freecodecamp.org/testable-projects-fcc/v1/bundle.js"></script>
 -->
!

CSS 

              
                :root {
    --success-color: #2ecc71;
    --error-color: #e74c3c;
    --primary-color: #7b1594;
}

html {
    box-sizing: border-box;
}
*,
*:before,
*:after {
    box-sizing: inherit;
}

pre{
  font-family: Monaco, Courier;
}

@mixin fade-underline {
    content: "";
    position: absolute;
    bottom: 2px;
    left: 0;
    height: 2px;
    width: 100%;
    background: #444;
    background: linear-gradient(
        left,
        transparent 0%,
        #7b1594 50%,
        transparent 100%
    );
}

@mixin fade-underline-left {
    @include fade-underline;
    background: linear-gradient(left, #7b1594 30%, transparent 100%);
}

body {
    font-size: 16px;
    background-color: #f9fafb;
    font-family: "Open Sans", sans-serif;
    display: flex;
  flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    margin: 0;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    text-align: center;
}

a {
    color: var(--primary-color);
}

p#description {
    text-align: center;
    font-style: italic;
    padding-bottom: 1rem;
    margin-bottom: 2rem;
}

.underline {
    position: relative;
    padding-bottom: 3px;
    bottom: 3px;
    &::after {
        @include fade-underline();
    }
    &-left {
        position: relative;
        padding-bottom: 3px;
        bottom: 3px;
        &::after {
            @include fade-underline-left();
        }
    }
}

.container {
    background: white;
    border-radius: 25px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3), 0 0 80px 80px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 600px;
    margin: 5%;
}

.form {
    padding: 1.5rem 1.8rem;
    button {
        cursor: pointer;
        background: var(--primary-color);
        border: 2px solid var(--primary-color);
        color: white;
        display: block;
        font-size: 16px;
        padding: 0.5rem;
        border-radius: 4px;
        width: 100%;
        margin-top: 1rem;
    }
}

.form-control {
    padding-bottom: 0.1rem;
    position: relative;
    & input,
    & select,
    & textarea {
        border: 2px solid #f0f0f0;
        border-radius: 4px;
        display: block;
        width: 100%;
        padding: 10px;
        margin: 1rem 0;
        font-size: 1rem;
    }

    label.floating {
        position: absolute;
        color: #333;
        display: block;
        margin-bottom: 5px;
        top: 8px;
        left: 14px;
    }
    input:valid,
    textarea:valid {
        background: white;
        z-index: -1;
    }
    input::placeholder {
        color: transparent;
    }
    input:focus,
    textarea:focus{
        border-color: var(--primary-color);
        outline: 0;
    }
    &.success,
    &.success input {
        border-color: var(--success-color);
    }
    &.error,
    &.error input {
        border-color: var(--error-color);
    }

    &.error small {
        visibility: visible;
    }

    small {
        position: absolute;
        bottom: -1px;
        font-size: 12px;
        opacity: 1;
        color: var(--error-color);
        visibility: hidden;
    }
    select {
        background-color: white;
        margin: 0;
        -webkit-box-sizing: border-box;
        -moz-box-sizing: border-box;
        box-sizing: border-box;
        -webkit-appearance: none;
        -moz-appearance: none;
        background-image: linear-gradient(45deg, transparent 50%, gray 50%),
            linear-gradient(135deg, gray 50%, transparent 50%),
            linear-gradient(to right, #ccc, #ccc);
        background-position: calc(100% - 20px) calc(1em + 2px),
            calc(100% - 15px) calc(1em + 2px), calc(100% - 2.5em) 0.5em;
        background-size: 5px 5px, 5px 5px, 1px 1.5em;
        background-repeat: no-repeat;
    }
    select:focus {
        background-image: linear-gradient(45deg, #7b1594 50%, transparent 50%),
            linear-gradient(135deg, transparent 50%, #7b1594 50%),
            linear-gradient(to right, #ccc, #ccc);
        background-position: calc(100% - 15px) 1em, calc(100% - 20px) 1em,
            calc(100% - 2.5em) 0.5em;
        background-size: 5px 5px, 5px 5px, 1px 1.5em;
        background-repeat: no-repeat;
        border-color: var(--primary-color);
        outline: 0;
    }
    select:-moz-focusring {
        color: transparent;
        text-shadow: 0 0 0 #000;
    }
    &.custom-inputs {
        margin-top: 20px;
        label {
            display: inline-block;
            position: relative;
            padding: 10px 35px;
            margin-bottom: 12px;
            cursor: pointer;
            user-select: none;
            &:focus,
            &:visited,
            &:active {

            }
        }

        //Display as a list not inline
        label.list {
            display: block;
        }

        label input {
            position: absolute;
            opacity: 0;
            cursor: pointer;
            height: 0;
            width: 0;
        }

        .checkmark {
            position: absolute;
            top: 10px;
            left: 0;
            height: 25px;
            width: 25px;
            background-color: #eee;
        }

        .container:hover input ~ .checkmark {
            background-color: #ccc;
        }

        label input:checked ~ .checkmark {
            background-color: var(--primary-color);
        }

        .checkmark:after {
            content: "";
            position: absolute;
            display: none;
        }

        label input:checked ~ .checkmark:after {
            display: block;
        }

        label .checkmark:after {
            left: 9px;
            top: 5px;
            width: 5px;
            height: 10px;
            border: solid white;
            border-width: 0 3px 3px 0;
            transform: rotate(45deg);
        }
    }
}

.form-control .form-control.error .form-control input:focus + label.floating,
.form-control.active > label.floating {
    transform: scale(0.75) translate3d(-16px, -113%, 0);
    transition: all linear 0.1s;
    background: white;
}

.form-control .active input::placeholder {
    color: #6d6d6d;
}
!

JS 

              
                const form = document.getElementById('survey-form');

var out = document.querySelector('.output');

function updateResult() {
  try {
    out.textContent = new URLSearchParams(Array.from(new FormData(form)));
  } catch (e) {
    out.textContent = e;
    out.className = 'error';
  }
}

form.addEventListener('submit', function handleSubmit(event){
  event.preventDefault();
  updateResult();
});

form.addEventListener('focusin', function handleFocus(event) {
    if (event.target.tagName == 'INPUT') {
        event.target.parentElement.classList.add('active');
    }
});

form.addEventListener('focusout', function handleBlur(event) {
    if (event.target.tagName === 'INPUT') {
        if (event.target.value === '')
            event.target.parentElement.classList.remove('active');
    }
});
!
999px

Console