.content{
    margin-left: auto;
    margin-right: auto;
    max-width: 100%;
    width: 1250px;

    display: grid;
        grid-template: 
            "main-header main-header main-header" auto
            "left-panel main-area right-panel" auto/220px auto auto/220px;
        grid-template-rows: auto auto;
        grid-template-columns: 220px auto 220px;
        grid-template-areas: 
            "main-header main-header main-header"
            "left-panel main-area right-panel";
    
}