*{
    box-sizing: border-box;
}
.container{
    margin: 0px auto;
    width: 90%;
    padding: 30px;
}
header {
    background-color:yellow;
    padding-top: 2em;
    text-align: center;
    height: 200px;
}
main{
    display: flex;
    flex-wrap: wrap;
}
.red{
    width: 100%;
    height: 100px;
    background-color: red;
}

.blue{
    width: 100%;
    height: 100px;
    background-color:blue;
}


.green{
    width: 100%;
    height: 100px;
    background-color: green;
}

.brown{
    width:100%;
    height: 100px;
    background-color: brown;
        
}

.pink{
    width:100%;
    height: 100px;
    background-color: pink;
        
}

.black{
    width:100%;
    height: 100px;
    background-color:black;
        
}

.gray{
    width:100%;
    height: 100px;
    background-color: gray;
        
}

.orange{
    width:100%;
    height: 100px;
    background-color:orange;
        
}

.blueviolet{
    width:100%;
    height: 100px;
    background-color:blueviolet;
        
}





@media screen and (min-width: 576px) and (max-width:992px){
   
    .green, .blue ,.brown,.pink,.black,.gray,.orange,.blueviolet{
        width: 50%;
    }
    .red{
       display: none;
    }
}

@media screen and (min-width: 993px){
    main{
        display: flex;
        flex-wrap: wrap;
    }
    .red, .blue,.brown, .pink, .gray, .orange{
        width: 33%;
    }
    .green, .black, .blueviolet{
        width: 34%;
    }
}



/*@media screen and (min-width: 1050px){
    main{
        display: flex;
        flex-wrap: wrap;
    }
    .red, .blue{
        width: 33%;
    }
    .green{
        width: 34%;
    }
}*/

@media screen and (orientation:landscape){
    header{
        background-color: orange;
        color: green;
    }

    .red,.blue.green{
        height: 100px;
        border: 5px;

    }
}