html,
body {
   width: 100%;
   height: 100%;
   margin: 0;
   padding: 0;
   background: #f1f1f1;
}

a{
   text-decoration: none;
}

nav{
   width: 100%;
   height: 40px;
   background-color: #fff;
   position: relative;
}

.zzlogo img{
   width: auto !important;
   height: 24px;
   display: block;
   position: absolute;
   top: 8px;
   left: 50%;
   transform: translate(-50% , 0);
}

.y-wrap {
   position: absolute;
   left: 0;
   right: 0;
   top: 0;
   bottom: 0;
   width: 100%;
   height: auto;
   margin: 0 auto;
}

.y-wrap img {
   width: 100%;
}

.footer_a{
   position: fixed;
   bottom: 15px;
   left: 50%;
   transform: translate(-50%, 0);
   z-index: 100;
   display: block;
   width: 70%;
   height: 40px;
   line-height: 40px;
   font-family: 'Franklin Gothic Medium', 'Arial Narrow', Arial, sans-serif;
   font-size: 16px;
   color: #fff;
   text-align: center;
   background-color: orangered;
   border-radius: 20px;
}