How to apply hover effect over button using SASS ? - GeeksforGeeks

14 Sep, 2021
Animation makes the user experience more beautiful and impressive. With the usage of HTML (HyperText Markup Language) elements and SASS ( Syntactically Awesome Stylesheet), we will design buttons that provide them with a colorful border and an animation effect. We will use Sass because it acts as a better substitute for CSS and a superset of CSS. Sass provides 100% compatibility to all browsers and provides a better syntax with a compiled CSS file. Sass provides two file extensions ‘SCSS‘ (Sassy Css) and  ‘SASS‘ (Indented Syntax). We will use SCSS extension and various features of SCSS.
Approach: We will introduce the button element and give the structure of the HTML page. We will use features of Sass to provide them with styling, border design using linear-gradient, and an animation effect. 
Step by step Implementation:
Step 1: First, we will design simple buttons using a button tag of HTML. We will start by creating an HTML file. Inside the HTML head tag, we will include the meta links and external files to include fallback fonts. Inside the body tag, we will include attributes, classes and Id’s to provide them with designs and button tags to make it clickable.
 
HTML
<!DOCTYPE html><html lang="en">  <head>    <meta charset="UTF-8">    <meta name="viewport"           content="width=device-width, initial-scale=1.0">    <link rel="stylesheet" href="index.css">    <link href="https://fonts.googleapis.com/css2?family=Cormorant+Garamond:wght@600&display=swap"          rel="stylesheet"></head>  <body>    <div class="container">        <div class="border_btn1 border_btn1_animate">            <button class="container_button1                            btn1-hover btn1-hover-animate">                Button 1            </button>        </div>        <div class="border_btn2 border_btn2_animate">            <button class="container_button2                            btn2-hover btn2-hover-animate">                Button 2            </button>        </div>    </div></body></html>
Step 2: We will create an SCSS file with a file extension .scss. We will include various features of SCSS. Variables that begins with a ‘$’ dollar sign and ends with a semicolon acts as a better tool to change the properties in a single place rather than searching in the entire code, Nesting include the parent class, and also we will use extend an element which helps to inherit the properties of an element. 
SCSS Code:
index.scss
/* Declaring variables */$range: 88vh;$background_color: #f3f3f3;$text-color: black;  /* Declaring a mixin function by    passing a actual argument */@mixin center($align) {  display: flex;  justify-content: center;  align-items: center;  flex-direction: $align;}*,*::before,*::after {  padding: 0px;  margin: 0px;  box-sizing: inherit;}  .container {    /* Calling a mixin function name center     by passing row as a information to     it's actual argument */  @include center(row);    /* Accessing variable using a '$' dollar sign */  height: $range;  button {    border: none;    @include center(row);    box-sizing: border-box;    cursor: pointer;    font-size: 21px;    font-weight: bold;    letter-spacing: 2px;    width: 200px;    height: 46px;    background-color: $background_color;    color: $text-color;    font-family: "Cormorant", "Garamond";    margin-left: 23px;    border-radius: 24px;  }    .border_btn1 {    width: 200px;    height: 44px;    padding: 3px;    border-radius: 41px;    margin-left: 21px;  }  .border_btn1_animate {    background: linear-gradient(      to left,      red,      orange,      yellow,      green,      blue,      indigo,      violet    );  }    #{&}_button1 {    margin-left: 0px;    height: 44px;    display: inline-block;    position: relative;  }  .border_btn2 {    width: 200px;    height: 44px;    padding: 3px;    border-radius: 41px;    margin-left: 21px;  }  .border_btn2_animate {    background: linear-gradient(      to right,      chartreuse,      #6161fd,      #fd31fd,      #ffb03a,      red    );  }    #{&}_button2 {         /* Inheriting the properties           of container_button1 */       @extend .container_button1;  }}.btn1-hover:hover:before,.btn2-hover:hover:before {  position: absolute;  left: 0px;  top: 0px;  line-height: 2.1;  min-width: 49px;  font-size: 100%;  border-radius: 24px;  background: rgba(0, 0, 0, 0.1);}  .btn1-hover:hover:before,.btn2-hover:hover:before {  content: url("");}.btn1-hover-animate:hover:before,.btn2-hover-animate:hover:before {  transition: width 0.5ms ease-in-out;  animation: change 1s forwards 1;}  @keyframes change {  0% {    width: 1px;  }  100% {    width: 200px;  }}
Step 3: CSS or Cascading Style Sheets is compiled with SCSS. The best thing about SCSS is that it provides the Compiled CSS with browser support which makes it compatible across major browsers. 
We used CSS flexible box layout to make the buttons appear centered, linear-gradient to provide the border of the button with the touch of gradient followed by the direction ‘to left’ instructs the color to start. Animation and keyframes are used to display the effects when the cursor is over the button, added animation shorthand properties  ‘animation: change 1s forwards 1‘ followed by animation-name – change, animation-delay-function: 1s, animation-fill-mode: forwards ( to stop the animation after the last keyframe ) animation-iteration-count-function: 1. 
When hovering the opacity of the background color of buttons, it will slightly increase the width from 1px to 200px depending upon the width of the button which is achieved by using the CSS keyframes. It’s not allowed to make any changes in the CSS file as it will automatically compile the SASS or SCSS file to CSS.
Compiled CSS Code:
index.css
/* Declaring variables *//* Declaring a mixin function by passing a actual argument */*,*::before,*::after {  padding: 0px;  margin: 0px;  box-sizing: inherit;}  .container {  /* Calling a mixin function name center by      passing row as a information     to it's actual argument */  display: flex;  justify-content: center;  align-items: center;  flex-direction: row;  /* Accessing variable using a '$' dollar sign */  height: 88vh;}.container button {  border: none;  display: flex;  justify-content: center;  align-items: center;  flex-direction: row;  box-sizing: border-box;  cursor: pointer;  font-size: 21px;  font-weight: bold;  letter-spacing: 2px;  width: 200px;  height: 46px;  background-color: #f3f3f3;  color: black;  font-family: "Cormorant", "Garamond";  margin-left: 23px;  border-radius: 24px;}.container .border_btn1 {  width: 200px;  height: 44px;  padding: 3px;  border-radius: 41px;  margin-left: 21px;}.container .border_btn1_animate {  background: linear-gradient(    to left,    red,    orange,    yellow,    green,    blue,    indigo,    violet  );}.container .container_button1,.container .container_button2 {  margin-left: 0px;  height: 44px;  display: inline-block;  position: relative;}.container .border_btn2 {  width: 200px;  height: 44px;  padding: 3px;  border-radius: 41px;  margin-left: 21px;}.container .border_btn2_animate {  background: linear-gradient(    to right,    chartreuse,    #6161fd,    #fd31fd,    #ffb03a,    red  );}.container .container_button2 {  /* Inheriting the properties of container_button1 */}  .btn1-hover:hover:before,.btn2-hover:hover:before {  position: absolute;  left: 0px;  top: 0px;  line-height: 2.1;  min-width: 49px;  font-size: 100%;  border-radius: 24px;  background: rgba(0, 0, 0, 0.1);}  .btn1-hover:hover:before,.btn2-hover:hover:before {  content: url("");}  .btn1-hover-animate:hover:before,.btn2-hover-animate:hover:before {  transition: width 0.5ms ease-in-out;  animation: change 1s forwards 1;}  @keyframes change {  0% {    width: 1px;  }  100% {    width: 200px;  }}
Output:
Attention reader! Don’t stop learning now. Get hold of all the important HTML concepts with the Web Design for Beginners | HTML  course.
CSS-Properties
CSS-Questions
HTML-Questions
SASS
CSS
HTML
Web Technologies
HTML
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