slide_in_demo/index.css

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

/*
** All animation keyframes definitions here
*/

@-webkit-keyframes slide-in-from-right {
    from { 
        -webkit-transform: translateX(120%);
        -ms-transform: translateX(120%);
        -o-transform: translateX(120%);
        transform: translateX(120%);
    }
    to {
        -webkit-transform: translateX(0);
        -ms-transform: translateX(0);
        -o-transform: translateX(0);
        transform: translateX(0);
    }
}
@-o-keyframes slide-in-from-right {
    from { 
        -webkit-transform: translateX(120%);
        -ms-transform: translateX(120%);
        -o-transform: translateX(120%);
        transform: translateX(120%);
    }
    to {
        -webkit-transform: translateX(0);
        -ms-transform: translateX(0);
        -o-transform: translateX(0);
        transform: translateX(0);
    }
}
@-moz-keyframes slide-in-from-right {
    from { 
        -webkit-transform: translateX(120%);
        -ms-transform: translateX(120%);
        -o-transform: translateX(120%);
        transform: translateX(120%);
    }
    to {
        -webkit-transform: translateX(0);
        -ms-transform: translateX(0);
        -o-transform: translateX(0);
        transform: translateX(0);
    }
}
@keyframes slide-in-from-right {
    from { 
        -webkit-transform: translateX(120%);
        -ms-transform: translateX(120%);
        -o-transform: translateX(120%);
        transform: translateX(120%);
    }
    to {
        -webkit-transform: translateX(0);
        -ms-transform: translateX(0);
        -o-transform: translateX(0);
        transform: translateX(0);
    }
}

/*
** Keyframe definition ends here
*/

body
{
    overflow-x: hidden;
}

.slide-container
{
    position: absolute;

    bottom: 2em;
    right: 2em;

    width: 20em;
    height: 15em;
}

.slide
{
    position: relative;

    width: 100%;
    height: 100%;
    
    box-shadow: 0 0 3px rgba(0,0,0,.6);
    padding: 1em;
    
    -webkit-animation: slide-in-from-right 1.5s;
    -o-animation: slide-in-from-right 1.5s;
    animation: slide-in-from-right 1.5s;
}

.slide-text
{
    font-family: sans-serif;
    font-size: 1em;
    color: rgb(50,50,50);

    width: 100%;
    height: 3em;

    padding: 0.25em .25em;
}

.highlight
{
    font-size: 1.2em;
}

.quote::before,.quote::after
{
    content: "'";
    width: 1em;
    height: 1em;
}

.slide-img {
  width: 100%;
  height: 10em;

  position: relative;
}

img {
  display: block;
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;

  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  -o-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}

.slide-close-btn
{
    position: absolute;
    top: 0;
    right: 0;
    
    padding: .375em .5em;
    background-color: rgba(255,255,255,0.5);

    font-family: sans-serif;
    font-size: .85em;
}