grid.css

html {
    box-sizing: border-box;
}

*, *:before, *:after {
    box-sizing: inherit;
}
* {
    border: 1px solid slategray;
    text-align: center;
}

p { 
  color: blue; 
} 
.container { 
  color: red; 
}

.row{
    width:100%;
    clear: both;
    color: blue;
    
}

.col-third{
    float: left;
    width:33.33%;
   
}

.col-half{
    width:50%;
    float: left;
}
.col-full{
    width: 100%;
    float:left;
}

.col-fourth{
    width: 25.00009%;
    float: left;
}
.col-twothirds{
    width: 66%;
    float: left;
    /*padding-left: 33%;  this moves the text inside the box */
    margin-left: 16.5%;  /*this moves the column box - a margin that is half of the width-100 from the float side will center it  */

}
.col-threefourths{
    width: 75%;
    float: left;
    margin-left: 12.5%
}
div{
    background-color:blue;
}

body > div{
    background-color: red;
}

div div{
    background-color: orange;
}

div a{
    background-color: black;
}