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HTML

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Adding Classes

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About the <head>

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Insecure Resource

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <div class="coordinates-checkbox">
  <input type="checkbox" id="display-coordinates" />
  <label for="display-coordinates">Display coordinates</label>
</div>

<div id="example" class="slide">
  <div class="slide__image-wrapper">
    <img class="slide__image" src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/225363/forest.jpg" alt="Woods landscape">
  </div>
  <div class="slide__content">
    <h2 class="slide__headline">In The Wilderness</h2>
    <button class="slide__action btn">Book Travel</button>
  </div>
  <div class="coordinates-overlay"></div>
  <div id="coordinates" class="coordinates-tooltip"></div>
</div>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css?family=Playfair+Display:700|IBM+Plex+Sans:500&display=swap');

:root {
  --color-primary: #56677E;
  --color-secondary: #101118;
  --base-duration: 500ms;
  --base-ease: cubic-bezier(0.25, 0.46, 0.45, 0.84);
}

// ================================================
// Transforms used for parallax effect
// Try changing the --d values within each rule-set
// and hover over the slide
// ================================================

.slide {
 --x: 0;
 --y: 0;
 --d: 50;
  
  &:hover .slide__image-wrapper {
    transform: 
      scale(1.025)
      translate(
        calc(var(--x) / var(--d) * 1px),
        calc(var(--y) / var(--d) * 1px)
      );
  }
}

.slide__image {
  --d: 20;

  transform: 
    translate(
      calc(var(--x) / var(--d) * 1px),
      calc(var(--y) / var(--d) * 1px)
    );
}

.slide__content {
  --d: 60;

  transform: 
    translate(
      calc(var(--x) / var(--d) * -1px),
      calc(var(--y) / var(--d) * -1px)
    );
}

// ========================
// Base
// ========================

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

html,
body {
  height: 100%;
}

body {
  background-color: var(--color-secondary);
  font-family: 'IBM Plex Sans', sans-serif;
  overflow-x: hidden;
  padding: 4rem 2rem;
  width: 100%;
}

h1, h2, h3 {
  font-family: 'Playfair Display', serif;
}

// ========================
// Button
// ========================

.btn {
  background-color: var(--color-primary);
  border: none;
  border-radius: 0.125rem;
  color: white;
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
  padding: 1em 2em 1.125em;
  position: relative;
  z-index: 1;
  
  &:active {
    transform: translateY(1px);
  }
}

// ========================
// Slide
// ========================

.slide {  
  align-items: center;
  color: white;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  text-align: center;
  width: 75vmin;
  z-index: 1;
  
  &:after {
    content: '';
    display: block;
    padding-bottom: 100%;
  }
}

// ========================
// Slide image wrapper
// ========================

.slide__image-wrapper {
  border-radius: 1%;
  height: 100%;
  left: 0%;
  overflow: hidden;
  position: absolute;
  top: 0%;  
  transition: transform calc(var(--base-duration) / 4) var(--base-ease);
  width: 100%;
}

// ========================
// Slide image
// ========================

.slide__image {
  --d: 20;
  
  height: 110%;
  left: -5%;
  object-fit: cover;
  pointer-events: none;
  position: absolute;
  top: -5%;
  transition: transform var(--base-duration) var(--base-ease);
  user-select: none;
  width: 110%;  
}

// ========================
// Slide headline
// ========================

.slide__headline {
  font-size: 8vmin;
  font-weight: 600;
  position: relative;
}

// ========================
// Slide content
// ========================

.slide__content {
  --d: 60;

  align-items: center;
  display: flex;
  flex-direction: column;
  height: 100%;
  justify-content: center;
  left: 0;
  padding: 4vmin;
  position: absolute;
  top: 0;
  transition: transform var(--base-duration) var(--base-ease);
  width: 100%;
  z-index: 1;
  
  > * + * {
    margin-top: 2rem;
  }
}

// ========================
// Coordinates
// ========================

.display-coordinates {
  .coordinates-overlay,
  .slide:hover .coordinates-tooltip {
    display: block;
  }
}

.coordinates-checkbox {
  align-items: center;
  color: white;
  display: flex;
  position: fixed;
  top: 1rem;
  
  label {
    font-size: 0.9rem;
    margin-left: 0.25rem;
  }
}

.coordinates-tooltip {
  color: red;
  display: none;
  pointer-events: none;
  position: absolute;
  white-space: nowrap;
  z-index: 100;
  
  &::after {
    counter-reset: x var(--x) y var(--y);
    content: 'x: ' counter(x) ', y: ' counter(y);
  }  
}

.coordinates-overlay {
  background-color: rgba(black, 0.8);
  display: none;
  height: 100%;
  position: absolute;
  width: 100%;
  z-index: 100;
  
  &:before,
  &:after {
    background: rgba(white, 0.5);
    content: '';
    height: 1px;
    left: 50%;
    position: absolute;
    top: 50%;
    width: 100%;
  }
  
  &:before {
    transform: translate(-50%, -50%);
  }
  
  &:after {
    transform: translate(-50%, -50%) rotate(90deg);
  }
}
!

JS 

              
                const slide = document.getElementById('example');
const tooltip = document.getElementById('coordinates');
const toggle = document.getElementById('display-coordinates');

slide.addEventListener('mousemove', function(e) {
  // Get dimensions of slide element
  const r = this.getBoundingClientRect()

  // Set x and y values prop values based on center of slide element
  this.style.setProperty('--x', e.clientX - (r.left + Math.floor(r.width / 2)))
  this.style.setProperty('--y', e.clientY - (r.top + Math.floor(r.height / 2)))
})

slide.addEventListener('mouseleave', function() {
  // Reset x and y prop values when no longer hovering
  this.style.setProperty('--x', 0)
  this.style.setProperty('--y', 0) 
})


document.body.addEventListener('mousemove', function(e) {
  // Have coordinate values follow the user's cursor
  tooltip.style.left = e.pageX - 15 + 'px';
  tooltip.style.top = e.pageY - 70 + 'px';
})

toggle.addEventListener('change', function(e) {
  // Toggle the display of coordinate values
  this.checked
    ? document.body.classList.add('display-coordinates')
    : document.body.classList.remove('display-coordinates')           
})
!
999px

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