@media screen and (max-width:720px){
    #master_footer{
          margin: 0px;
    padding: 0px;
/*     position: fixed; */
    width: 100%;
/*     bottom: 0px; */
/*     margin-bottom: -60px; */
     }
     #home_menu{
         height:100px;
	     position: fixed;
	     width: 100%;
	     top: 0px;
	     z-index: 999999;
     }
     .learn5{
     
     
    background-position: 100%;
    background-size: cover;
    height: 220px;
    width: 100%;
    margin-bottom: -7rem;
    background: background: #191E4F;
    background: #191E4F;
}
.down_btn{
             position: absolute;
    /*width: 241px;*/
    height: 12px;
    font-size: 13px;
    font-family: Arial, Arial-Regular;
    font-weight: 400;
    color: #ffffff;
    left: 40%;
    margin-top: 8rem;
}
.down_btn2{
           position: absolute;
    width: 241px;
    height: 12px;
    font-size: 13px;
    font-family: Arial, Arial-Regular;
    font-weight: 400;
    color: #ffffff;
    left: 35%;
    margin-top: 11rem;
}
.learn5 p:nth-child(2){
	      margin: 0px 1rem 0px 0px;
    width: 440px;
    /* float: left; */
    /* clear: both; */
    position: absolute;
    width: auto;
    height: 32px;
    font-size: 15px;
    font-family: Arial, Arial-Regular;
    font-weight: 400;
    text-align: left;
    color: #ffffff;
    left: 40%;
    margin-top: 4rem;
}
.down_img{
 width: 50%;
    /* float: right; */
    /* padding-top: 100px; */
    background: url(../img/wtb/xiazai@2x.png) no-repeat 0;
    background-position: top;
    background-size: contain;
    height: 200px;
    left: 0px;
    margin-top: 10px;
    float: left;
    /* width: 100%; */
    /* margin-top: 50px; */
    /* margin-left: 20%; */
    margin-left: -1rem;
}
button{
    border: none;
    background: #8045f900;
}
/*.android_btn{margin-left:2rem;}*/
.google_btn img{width:5rem;}
.android_btn img{width:5rem;}
 }
 @media screen and (min-width:721px){
      #master_footer{
          margin: 0px;
    padding: 0px;
/*     position: fixed; */
    width: 100%;
/*     bottom: 0px; */
/*     margin-bottom: -60px; */
     }
     #home_menu{
         height:100px;
	     position: fixed;
	     width: 100%;
	     top: 0px;
	     z-index: 999999;
     }
     .learn5{
    clear: both;
    /* margin: 0px 0px 80px 0px; */
   /* background: url(../img/bg2@2x.png) no-repeat 0;*/
    background-position: center;
    background-size: cover;
    height: 555px;
    width: 100%;
    /* padding-bottom: 50px; */
    margin-bottom: -50px;
        background: #191E4F;
}
.down_btn{
   position: absolute;
    /* width: 241px; */
    height: 12px;
    font-size: 13px;
    font-family: Arial, Arial-Regular;
    font-weight: 400;
    text-align: right;
    color: #ffffff;
    left: 45%;
    margin-top: 16rem;
}
.down_btn2{
   position: absolute;
    /* width: 241px; */
    height: 12px;
    font-size: 13px;
    font-family: Arial, Arial-Regular;
    font-weight: 400;
    text-align: right;
    color: #ffffff;
    left: 45%;
    margin-top: 22rem;
}
.learn5 p:nth-child(2){
      width: 440px;
    /* float: left; */
    /* clear: both; */
    position: absolute;
    /* width: 241px; */
	height: 32px;
	font-size: 15px;
	font-family: Arial, Arial-Regular;
	font-weight: 400;
    text-align: left;
    color: #ffffff;
    left: 45%;
    margin-top: 8rem;
}
.down_img{
/*float: right; */
    /* padding-top: 100px; */
    background: url(../img/wtb/xiazai@2x.png) no-repeat 0;
    background-position: top;
    background-size: contain;
    height: 436px;
    left: 0px;
    /* margin-top: 100px; */
    float: left;
    width: 100%;
    margin-top: 50px;
    /* margin-left: 20%;*/
    margin-left:5%;
}
button{
    border: none;
    background: #8045f900;
}
.google_btn{margin-right:50px;}
.google_btn img{width:160px;}
.android_btn img{width:160px;}
}