For adding cutom styles in seattle master page you have to edit the .html file and there is a proper syntax to add styles.

 

<!–MS:<style type=”text/css”>–>
<!–
 #suiteLinksBox
{
    display: none !important; /*as requested by cusomer – hide suite bar links*/
}
–>
<!–ME: </style>–>

 

You have to start with <!–MS :  and end with <!–ME

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