/* css reset rule */
* {
  margin: 0; padding: 0;   
}


/* type selector */

body {
    background-color: blue; 
    color: #EEE;
    font-family: verdana, arial, sans-serif;
    margin: 4px;
    border: #222;
}

header {
  background-color: #222; 
  padding: 12px;
  text-align: center;
}

/* child selector */

header > h1 {
  text-align: center;
  font-weight: normal;
  text-transform: uppercase;
  color: yellowgreen;
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 2px solid yellow;
}

/* descendent selector */

header span {
  display: block;  
  border: 0px;
  color: #FF4;
}


/* class selector */

.subtitle {
  text-align: center;
  /* border: 2px solid #222; */
  padding: 10px;
  line-height: 1.5;
  text-transform: lowercase;
  letter-spacing: 8px;
}

/* =============================== */
/* CSS Examples */

section {
   display: flex;
   justify-content: center;
   flex-flow: row wrap;
   border: 2px solid yellow; 
   margin-bottom: 800px;
}

section article {
  border: 2px solid hotpink;
  max-width: 360px;
  min-height: 200px;
  margin: 10px;
  flex: 0 0 auto;
  padding: 4px;
}

article h2 {
  font-size: 16pt;  
}

article p {
  margin: 8px;
  line-height: 1.4;  
}

/* ID selecto */
#art1 div {
  width: 70%;
  aspect-ratio: 2/1;
  background-color: skyblue;
  margin: 20px auto;
  border-radius: 20px;
}

#art2 div {
  width: 70%;
  aspect-ratio: 2.5/1; 
  background-color: #000;
  /* center a black */
  margin: 20px auto; 
  border-radius: 20px;
  box-shadow: -4px 8px 14px white;
}

#art3 h2 {
  font-family: "Pacifico", cursive;
  text-align: center;
  font-size: 18pt;
  color: #FF3;
  border: 2px solid yellowgreen;
}

#art4 {
  /* use position relative on the parent */  
  position: relative;  
}

#art4 h2 {
  color: #FF3;
  /* use postion absolute on the child you want to munipulate */
  position: absolute;  
  bottom: 10px; left: 0;
  border: 0px solid yellowgreen;
  width: 100%;
  text-align: center;
  padding-bottom: 10px
}

#art5 {
  position: relative;  
}

#art5 div {
  /* setting position absolute to ALL divs within art5 */  
  position: absolute;  
}

#art5 div:nth-of-type(1) {
  width: 40%; aspect-ratio: 1/1;
  background-color: #F44;
  bottom: 10px; left: 64px;
  z-index: 5;
}


#art5 div:nth-of-type(2) {
  width: 40%; aspect-ratio: 1/1;
  background-color: #44F;
  bottom: -10px; right: 64px;
  z-index: 3;
}

#art6 {
  transition: all 300ms linear;
}
/* pseudo element */
#art6:hover {
  background-color: #404;
  color: #FF4;  
  border: 2px solid yellowgreen;
}

/* adjacent selector */

header + p {
  display: none; 
}






















/* css ruleset, aka rule
selector {
  declaration1;
  declaration2;
  property: value;
  property: value;
  property: value1, value2, value3;
  property: value value;
}
  */