CSS

.element {
      transition-property: width , height;
      transition-duration: 2s;
   }
.element:hover {
  filter : brightness(110%);
}
.element:active {
  transform : translate( 0 , 0.3rem);
  box-shadow: 0 2px 0 grey;
}
.loaderBox img {
  position : fixed;
  top : 50%;
  left : 50%;
  transform : translate( -50% , -50% )
}
 //OverLay. ( 1st Way )
  .parent {
       background: url("./folder1/img.jpg') no-repeat center center/cover;
  }
  .child { 
      background-color : rgba(0,0,0,0.5);
    //It will add Black ( required ) layer on the top of the parent-Background Image. 
    }       

------------------------------------------------------------------------

 //BackgroundImage, Adding Layer on the top of the Image. ( 2nd Way )
// Adding Image and providing Layer on that specific background only.
.selectContainer {
    background: linear-gradient(
        to bottom,
        rgba(0, 0, 0, 0.377),
        rgba(0,0,0, 100)
      ),url(/r/featured.jpg) no-repeat center center/cover;
}
.parent {
  display : grid;
  
  //work with columns.
  grid-template-columns : 1fr 2fr 1fr;
  //content will be in ratios (1 : 2 : 1)
  //Or
  grid-template-columns : 200px auto 200px;
  //first and third will be 200px and middle will take whole place.
  //Or
  grid-template-columns : auto auto;
  //Or
  grid-template-columns : repeat(3,auto);
  grid-gap : 1rem;
  //Will create gap between Each items.

  //Work With Rows.
  grid-template-rows : 1fr 1fr;
  grid-auto-rows : 4fr;
  // Will triple the size by '4fr' after two (as only two are mentioned) Rows. 
}

/*
.parent {
 //Not used often. ( auto responsive but does not look good every time ).
  grid-template-columns: repeat(auto-fit, minmax(200px , 1fr))}
*/

.singleItem {
   //Spanning rows or columns. ( Lines should be counted ( horizontal or Vertical ).)
  //Here the Values are the postions of the current col/row.
     grid-column-start: 1;
     grid-column-end: 4;
     //or
     grid-column : 1 / span 3;   
  
     grid-row-start: 1;
     grid-row-end: 3;
     //or
     grid-row: 1 / span 2; 
}

//Grid , grid-template-areas.
.gridParent {
  padding : 8px;  
  display : grid;
  grid-template-areas:
    'header header header'
    'content box-1 sidebar'
    'footer footer footer';
    grid-gap: 1rem; 
}

.header  {  grid-area: header;}
.content {  grid-area: content;}
.sidebar {  grid-area: sidebar;}
.box-1   {  grid-area: box-1; }
.footer  {  grid-area: footer;}
//Ways for : Installation for compiling Sass.

 > npm init -y
// Install the package.json file on directory 

 > npm install node-sass
//Install 'node-sass' as dependencies.

//Edit Package.json File.
"scripts": {
 "sass": "node-sass -w scss/ -o dist/css/ --recursive"
  }

> npm run sass
// To Run Sass, ( Just once is needed ) . IF adding any Partials, Need to run the command again.
// <------> Varia bles and Partials.
// Partials are Similar like components,We can store 'variables'(_variables) here, Which Can be re-used in different css stylesheets.
$colorRed : red;
body {
    background : $colorRed;
}


//Nesting and Structuring
// '&' Will refer to the Parent element which is class '.section'
.section  {
    h3 {
        font-size: 1.6rem;    
        color : black;
    }
    p {      }
    &-A {
        background-color: rgba(48, 245, 196, 0.329);
        padding : 10px 20px;
    }
    &-B {
        background-color: rgba(91, 194, 60, 0.329);
        padding : 0 20px;
    }
    &-C {
        background-color: rgba(98, 137, 245, 0.774);
        padding : 10px 20px;
    }
}

a {
    text-decoration: none;
    color : blue;
    &:hover {
        color : red;
        cursor: pointer;
    }
    &:active {
     color : goldenrod;
    }
}

//Inheritance & Contrast.
%btn-shared {
    text-decoration: none;
    color : blue;
    display: block;
    text-align: center;
}

a {
    @extend %btn-shared;
    //All the styling from 'btn-shared' Will be applied.
    &:hover {
        color : red;
        cursor: pointer;
    }
  
}

//Functions , Mixins.
 //It's Good idead to have functions and variables on a separate Partials ( separate File, Import to current file )
@function set-text-color($color){
    @if(lightness($color) > 50){
        @return #000;
    }@else {
        @return #fff;
    }
}
header {
 background-color: black;
 color : set-text-color(red);
 font-size: 2.0rem;
 line-height: 1.5;
}
    //Mixin
@mixin transformScss($propertyName){
    transform: $propertyName;
}

h1 {
    @include transformScss(rotate(20deg));
}
//Ways for : Installation for compiling Sass.

 > npm init -y
// Install the package.json file on directory 

 > npm install node-sass
//Install 'node-sass' as dependencies.

//Edit Package.json File.
"scripts": {
 "sass": "node-sass -w scss/ -o dist/css/ --recursive"
  }

> npm run sass
// To Run Sass, ( Just once is needed ) . IF adding any Partials, Need to run the command again.
// <------> Varia bles and Partials.
// Partials are Similar like components,We can store 'variables'(_variables) here, Which Can be re-used in different css stylesheets.
$colorRed : red;
body {
    background : $colorRed;
}


//Nesting and Structuring
// '&' Will refer to the Parent element which is class '.section'
.section  {
    h3 {
        font-size: 1.6rem;    
        color : black;
    }
    p {      }
    &-A {
        background-color: rgba(48, 245, 196, 0.329);
        padding : 10px 20px;
    }
    &-B {
        background-color: rgba(91, 194, 60, 0.329);
        padding : 0 20px;
    }
    &-C {
        background-color: rgba(98, 137, 245, 0.774);
        padding : 10px 20px;
    }
}

a {
    text-decoration: none;
    color : blue;
    &:hover {
        color : red;
        cursor: pointer;
    }
    &:active {
     color : goldenrod;
    }
}

//Inheritance & Contrast.
%btn-shared {
    text-decoration: none;
    color : blue;
    display: block;
    text-align: center;
}

a {
    @extend %btn-shared;
    //All the styling from 'btn-shared' Will be applied.
    &:hover {
        color : red;
        cursor: pointer;
    }
  
}

//Functions , Mixins.
 //It's Good idead to have functions and variables on a separate Partials ( separate File, Import to current file )
@function set-text-color($color){
    @if(lightness($color) > 50){
        @return #000;
    }@else {
        @return #fff;
    }
}
header {
 background-color: black;
 color : set-text-color(red);
 font-size: 2.0rem;
 line-height: 1.5;
}
    //Mixin
@mixin transformScss($propertyName){
    transform: $propertyName;
}

h1 {
    @include transformScss(rotate(20deg));
}
//1.
element {
 position : fixed;
  width : 50%;
} 
 /*  If the element's 'position' is 'fixed'.
 Then % styled  apllied on the element works in respect to the VH or VW.
 */

                      /* --------------------------- */

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