*, html {
    margin: 0;
    padding: 0;
}
.container {
    position: relative;
    max-width: 1240px;
    margin: 0 auto;
    padding: 50px;
}

#mainContainer {
    display: flex;
    background-color:cornsilk;
}
#aside {
    padding: 10px;
    width: 30%;
    background-color: rgb(124, 124, 224);
    margin-right: 35px;

}
#aside > a{
    display: block;
    border: 1px solid blue;
    border-radius: 10px;
    color: blanchedalmond;
    text-decoration: none;
    text-transform: uppercase;
    margin-bottom: 10px;
    
}