h1{
    text-align: center;
}
    .gb2{
    background-image: url("../images/androidtvbox/1gb8gb3.jpg");
    color:yellowgreen;
    color:gray;
    font-weight: bold;
    font-family: Arial, Helvetica, sans-serif;
}
.gb2{
    padding-top: 60px;
    margin: 0px;
    width:33%;
    height:455px;
    background-size: 100%;
    background-repeat: no-repeat;
    float: left;
}
.gb4,.gb6{
    padding-top: 60px;
    margin: 0px;
    width:33%;
    height:455px;
    background-size: 100%;
    background-repeat: no-repeat;
    float: left;
}
.gb4{
    background-image: url("../images/androidtvbox/2gb16gb2.jpg");
    color:yellowgreen;
    color:gray;
    font-weight: bold;
    font-family: Arial, Helvetica, sans-serif;
}
.gb6{
    background-image: url("../images/androidtvbox/3gb32gb2.jpg");
    color:gray;
    font-weight: bold;
    font-family: Arial, Helvetica, sans-serif;
}
.cartoptions select{
    background-color: transparent;
    border: none;
}
.cartoptions a{
    padding:3px;
    text-decoration: none;
    color: red;
    border:2px solid lightcoral;
    border-radius: 12px 12px ;
}
.cartoptions a:hover{
    color:blue;
}
.cartoptions a:focus{
    color:green;
}
body a{
    float: right;
}
@media (max-width:500px){
    
    .gb4,.gb2{
        padding: 0px;
        margin-top: 120px;
        margin-bottom:15px; 
        width:100%;
        height:310px;
        background-size: 100%;
        background-repeat: no-repeat;
    }
    .gb6{
        padding: 0px;
        margin-top: 120px;
        margin-bottom:150px; 
        width:100%;
        height:310px;
        background-size: 100%;
        background-repeat: no-repeat;
    }
    body a{
        float: right;
    }
    iframe{
        width:100%;
        height: auto;
    }
}