Check out example codes for "css animation left to right". It will help you in understanding the concepts better.

Code Example 1

//css code
#leftToRight{
  animation: run ease 3s;
  -webkit-animation: run ease 3s;
  -moz-animation: run ease 3s;
  -o-animation: run ease 3s;
  -ms-animation: run ease 3s;
}   

@keyframes run {
  0% { margin-left: -98%;}
  100%{ margin-left: 0%;}
}

@-moz-keyframes run {
  0% { margin-left: -98%;}
  100%{ margin-left: 0%;}
}

@-webkit-keyframes run {
  0% { margin-left: -98%;}
  100%{ margin-left: 0%;}
}

@-o-keyframes run {
  0% { margin-left: -98%;}
  100%{ margin-left: 0%;}
}

@-ms-keyframes run {
  0% { margin-left: -98%;}
  100%{ margin-left: 0%;}
}

//html code
<div id="leftToRight"></div>

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