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Create long shadow using CSS 3

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Nov 18, 2017 am 11:35 AM

css projection

In the most popular flat design at the moment, long shadow is a tried and tested design skill. Today I will teach you how to create a long shadow, how to use PS and CSS3 to achieve the long shadow effect.

For example, the following one is a very classic long projection design:

Create long shadow using CSS 3

##Photographers usually choose long shadows to bring dramatic effects to pictures. In nature, long shadows occur at dusk, when the sun is close to the horizon, and objects on the horizontal ground will have a long shadow effect when viewed from above. In interface design, we usually use the effect of simulating a 45-degree angle to simulate sunlight coming from the northwest corner, thus forming a sharp contrast with the theme of the design. There are many ways to create a long shadow using

photoshop. You can read about the four commonly used methods to create a long shadow effect. My favorite method is also the fourth, which is achieved by copying and moving layers. The effect, such as this picture I uploaded on behance,

Create long shadow using CSS 3

The general principle is that you copy the current layer, select the layer style, fill it with black, and then Move it below the original layer. Then you can use the mouse or filter to pan, move up one unit and move down one unit.

Create long shadow using CSS 3

#Then, we duplicate this layer and translate it again. Then merge the two shadow layers

Create long shadow using CSS 3

Then we repeat the action, that is, copy this layer once, move it down and move it 2 units to the right . Perform the merge again. Copy, move an even number of units, merge, and repeat.

Of course it will be more convenient if you use Filter->Others->Displacement

Create long shadow using CSS 3

This is roughly the effect, and then finally set it Transparency is good.

Create long shadow using CSS 3

#The above is about design. How does the front end achieve such an effect through css code? The first thing everyone thinks of is

text-shadow

## flatcolors is a website that has many color schemes that you can use at any time. Let's set the background color for the body. I prefer blue. Next, we go to google font to select the font we like. It doesn’t matter if you think the default font is acceptable. Just choose Passion One

### and then introduce it in the css code. ###

@import url(‘https://fonts.googleapis.com/css?family=Passion+One‘);

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###At this time, let’s type a few letters in our body, such as long shadow###

<body>  
  <h1>Long Shadow</h1>
</body>

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###Then we define some basic styles of h1;###

h1{  
  text-align:center;
  font-size:6rem;
  padding-top:2rem;
}

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###Next The core thing to achieve is to write the text-shadow code######The value of text-shadow can have the displacement of the x and y axes, plus the blur radius and color. ###

/* offset-x | offset-y | blur-radius | color */
text-shadow: 1px 1px 2px black;

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###We only need to pan repeatedly, and then make the color approach the background color. ######This is the code###

text-shadow： 1px 1px rgba(18, 67, 100, 0.5) , 2px 2px rgba(20, 72, 107, 0.51) , 3px 3px rgba(22, 76, 113, 0.52) , 4px 4px rgba(23, 81, 119, 0.53) , 5px 5px rgba(25, 85, 125, 0.54) ...

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###But it is definitely unrealistic to write it like this. You need to repeatedly calculate the step size and growth. Fortunately, we have preprocessing frameworks such as scss and less. We can complete color conversion and growth very conveniently. ######scss code implementation reference###

@function longshadow($color_a,$color_b,$stepnum, $opacity: 1){
 
  $gradient_steps: null;
 
  <a href="http://www.jobbole.com/members/lowkey2046">@for</a> $i from 1 through $stepnum {
 
    $weight: ( ( $i - 1 ) / $stepnum ) * 100;
 
    $colour_mix: mix($color_b, rgba($color_a, $opacity), $weight);
 
    $seperator: null;
 
    @if($i != $stepnum){
      $seperator: #{&#39;,&#39;};
    }
 
    $gradient_steps: append( #{$gradient_steps}, #{$i}px #{$i}px $colour_mix $seperator );
 
  }
 
  @return $gradient_steps;
 
}

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###The execution effect of the function is similar to when I pass in a color a and a color b, where color a is the color where the shadow starts, and color b is the background The color, the step size is similar to how long you want your shadow to be, and the last one is transparency. Then it's calculation. We move one unit each time, then decrease the color by percentage, and finally organize the style. ######At this time we only need to use this function in the h1 style ###

@include text-shadow(longshadow(darken($bg,30%),$bg,50, 0.5));

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###$bg: is the color of our background: #3498db. ######Related Reading:###

css to realize the moving cat face

css variable description and tutorial

Introduction to how to set DIV scroll bar properties and styles

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