:root {  
  line-sizing: normal;    
  --heading-color: red;
  --duration: 0s;
  --timing: ease-in-out;
  --background-color: rgb(15, 15, 15);
  --text-color: rgb(240, 240, 240);
  --shadow-color: rgba(240, 240, 240, 0.5);
  --accent-color: rgba(240, 0, 0, 0.5);    
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001s !important;
    transition-duration: 0.001s !important;
  }
}

*, ::before, ::after {
  box-sizing: border-box;
}

body {
  width: 100vw;  
  max-width: 100%;
  overflow-x: hidden;
  color: var(--text-color);
  background-color: var(--background-color);
  margin: 0;
  font-family: sans-serif;
  font-size: 12pt;
  display: flex;
  justify-content: center;
}

a:link,
a:active,
a:hover,
a:focus,
a:visited {
  color: var(--text-color);
  text-decoration: none;
  border-bottom: 0.1rem solid var(--accent-color);
}

a:active,
a:hover,
a:focus {
  text-shadow: 0.1rem 0.1rem 0.1rem var(--shadow-color);  
}

main {
  overflow-x: hidden;
  margin: 1rem;
  width: 100%;
  max-width: 30rem;
  position: relative;
  
}

ul {
  margin: 0;
  padding: 0;  
  list-style: none;  
}

li { 
  margin: 1rem;
}

h1 {
  color: var(--heading-color);
  text-shadow: 0.1rem 0.1rem 0.1rem var(--shadow-color);
}

img {
  background-image: url('placeholder.svg');  
  background-repeat: no-repeat;
  background-position: center;    
  background-size: 75%;    
  max-width: 100%;
  height: auto;
  display: block; 
  filter: grayscale(50%);
  opacity: 0.5;
  background-color: var(--background-color);
  transition: transform var(--duration) var(--timing),
      opacity var(--duration) var(--timing);
}

img.outofsight {    
  background-size: 75%;          
}

img.insight {
  opacity: 1;
  background-size: contain;  
}

img:hover {
  transform: scale(1.1);  
}

li:nth-child(even) img.outofsight {
  transform: translateX(100vw);     
}

li:nth-child(odd) img.outofsight {
  transform: translateX(-100vw);     
}