Mon pied de page n'est pas assis au bas de ma page

J'ai des problèmes avec le pied de page de mon site Web. Je veux que cela colle au bas de la page (après son contenu) Quelqu'un peut-il m'aider?

Edit: Je peux voir le pied de page avec mon deuxième écran (le plus grand) mais dans mon écran d'ordinateur portable, je ne peux voir que 1 / 4ème du pied de page. P>

CodePen Link! https://codepen.io/jimdiew/pen/zyrpqdp p>

HTML P>

*{
    padding: 0;
    margin: 0;
    text-decoration: none;
    list-style: none;
    box-sizing: border-box;
}
html {
    position: relative;
    width: 100%;
    height: 100%;
}

.site-container {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.site-content{
    flex:1;
}

body{
    font-family: sans-serif;
    margin: 0px;
    padding: 0px;
   }

.header-main{
    background: white;
    height: 100px;
    width: 100%;
}

label.logo{
    color: #98979b;
    font-size: 35px;
    line-height: 80px;
    padding: 0 50px;
    font-weight: bold;
}

.header-main ul{
    float: right;
    margin-right: 20px;
}

.header-main ul li{
  display: inline-block;
  line-height: 80px;
  margin: 0 5px;
}

.header-main ul li a {
    color: #aaabad;
    font-size: 17px;
    text-transform: uppercase;
    padding: 9px 15px;
    border: 3px; 
}

.header-main a.active, a:hover {
    background: #6dc4c6;
    transition: .3s;
}

.header-main ul li a:hover {
    color: #ffffff;
}

 /*SLIDER*/

html, body{
    width: 100%;
    height: 100%;
    padding: 0;
}

slider {
    display: block;
    width: 100%;
    height: 100%;
    background-color: #98979b;
    overflow: hidden;
    position: absolute;
}

slider > * {
    position: absolute;
    display: block;
    width: 100%;
    height: 100%;
    background: #98979b;
    animation: slide 12s infinite;
    overflow: hidden;
}

slide:nth-child(1){
    left: 0%;
    animation-delay: -1s;
    background-image: url(images/image-1.jpg);
    background-size: cover;
    background-position: center;
}

slide:nth-child(2){
    left: 100%;
    animation-delay: 2s;
    background-image: url(images/image-2.jpg);
    background-size: cover;
    background-position: center;
}

slide:nth-child(3){
    left: 100%;
    animation-delay: 5s;
    background-image: url(images/image-3.jpg);
    background-size: cover;
    background-position: center;   
}

slide:nth-child(4){
    left: 100%;
    animation-delay: 8s;
    background-image: url(images/image-1.jpg);
    background-size: cover;
    background-position: center;
}

slide:nth-child(5){
    left: 100%;
    animation-delay: 11s;
    background-image: url(images/image-2.jpg);
    background-size: cover;
    background-position: center;
}

@keyframes slide{
    0% { left: 100%; width: 100%; }
    5% { left: 0%; }
    25% { left: 0%; }
    30% { left: -100%; width: 100%; }
    30.0001% { left: -100%; width:0%; }
    100% { left:100%; width:0%; }
}

.site-footer {
    width: 100%;
    height: auto;
    margin: auto;
    background: #6dc4c6;
    padding: 15px 0px;
    bottom: 0;
    right: 0;
    left: 0;
    margin-bottom: 0px;
    overflow: hidden;
}

.footer-social-icons{
    width: 100%;
    height: auto;
    margin: auto;
}

.footer-social-icons ul {
    margin: 0px;
    padding: 0px;
    text-align: right;    
}

.footer-social-icons ul li {
    display: inline-block;    
    width: 30px;
    height: 30px;
    margin: 0px 10px;
    border-radius: 100%;
    background: white;
}

.footer-social-icons ul li a{
    color: #98979b;
    font-size: 10px;
    padding-right: 6px;
}

.footer-social-icons ul li a i {
    line-height: 30px;

}

.footer-social-icons ul li  a:hover i{
    color: #98979b;
}

.site-content {
    background-color:  #98979b;
    position: relative;

}

.row{
    display: flex;
    flex-wrap: wrap;
    padding: 0;
}

.column {
    flex: 25%;
  max-width: 25%;
  padding: 0;
}

.column img {
    margin-top: 0px;
    vertical-align: middle;
    width: 100%;
}

.container {
    margin-top: 0px;
    vertical-align: middle;
    width: 100%;
}

.content {
    position: relative;
  width: 100%;
  max-width: 400px;
  margin: 0;
  overflow: hidden;
}

.content .content-overlay {
    background: rgba(109, 196, 198, 1);
    position: absolute;
    height: 99%;
    width: 100%;
    left: 0;
    top: 0;
    bottom: 0;
    right: 0;
    opacity: 0;
    -webkit-transition: all 0.4s ease-in-out 0s;
    -moz-transition: all 0.4s ease-in-out 0s;
    transition: all 0.4s ease-in-out 0s;
}

.content:hover .content-overlay{
    opacity: 0.5;
}

.content-image{
    width: 100%;
}

.content-details {
    position: absolute;
    text-align: center;
    padding-left: 1em;
    padding-right: 1em;
    width: 100%;
    top: 50%;
    left: 50%;
    opacity: 0;
    -webkit-transform: translate(-50%, -50%);
    -moz-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
    -webkit-transition: all 0.3s ease-in-out 0s;
    -moz-transition: all 0.3s ease-in-out 0s;
    transition: all 0.3s ease-in-out 0s;
}
  
.content:hover .content-details{
    top: 50%;
    left: 50%;
    opacity: 1;
}
  
.content-details h1{
    color: #fff;
    font-weight: 500;
    letter-spacing: 0.15em;
    margin-bottom: 0.5em;
    text-transform: uppercase;
  }
  
  .content-details p{
    color: #fff;
    font-size: 0.8em;
  }
  
  .fadeIn-bottom{
    top: 80%;
  }

/* PARA MOBILE */
@media screen and (max-width: 800px) {
    .column {
      flex: 50%;
      max-width: 50%;
    }
    .container{
        width: 33.33333%;
      }
  }

@media (max-width: 640px) {
    label.logo {
       font-size: 40px;  
       text-align: center;
       width: 100%;
       padding:0;
       display: block;
    }
    .container{
        width: 100%;
      }

   ul{
       position: fixed;
       width: 100%;
       height: 30vh;
       background: #6dc4c6;
       top: 80px;
       left: 0;
       text-align: center;
   }
   nav {
       color: white;
   }
   nav ul li {
       display: block;
   }
   nav ul li a {
       font-size: 20px;
       color: white;
   }
   a:hover, a.active{
       background: none;
       color: #0199a7;
   }
   slider{ 
    margin-top: 240px;
    }
    .column {
        flex: 100%;
        max-width: 100%;
      }
}