I have updated the service pack and getting the AEM grid issue.
AEM gird style is overwriting the actual styling.
How can we remove aem-grid-10 class from HTML
You can overwrite the out of the box style sheet and update the width as needed or you can add !important to custom style, so that out of the box style will be overwritten
width: 100% !important
or add more levels to the css like adding ".container.responsivegrid" more levels will be given preference while adding styles.