img{
    max-width: 100%;
    max-height: 150 px;
    margin-left: auto;
    margin-right: auto;
    display: block;
}

.container{
    width: 100%;
    max-width: 1200px;
    margin:auto;
}
aside{
    /*background: #cccccc;*/
    padding: 25px;
    width: 30%;
    float: right;
    box-sizing: border-box;
}

main{
    width: 70%;
    float: left;
}



.intro{
    font-weight: bold;
}



.container a{
    background-color: #05A696;
    color: #ffffff;
    text-decoration: none;
    padding: 5px;
    border-radius: 20px;
    padding-left: 20px;
    padding-right: 20px;
    display: inline-block;
    transition: background 0.3s, color 0.3s;
}

.container a:hover{
    background: #aaa;
    color: #fff;
}

.intro{
    font-weight: bold;
}

@media screen and (max-width: 700px) {
    
    main{
        width: 50%;
    }

    aside{
        width: 50%;
    } 
}

@media screen and (max-width: 535px) {
    
    aside{
        float: none;
        width: 100%;
    }
    main{
        width: 100%;
        float: none;
    }
      
}