Email Notification Give Error About Javascript when there is no Javascript being used?

Currently trying to revamp the email notification template we are using to convey information about ETO requests to make them more readable. Wrote up some CSS and used a <style> tag to inject it rather than writing it directly inline. the <style> tag has a type of text/css, yet I am getting an error about using javascript? Is it the tag type that is triggering this error? 

<style type="text/css">.EmailBody__sectionTitle {
        font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        color: #1d1d1d;
        font-weight: 800;
        text-decoration: underline;
    }
    .subContainer__label {
        font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        font-weight: 400;
        font-size: 1.2em;
        color: #0000FF;
    }
    .subContainer__data {
        font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        font-size: 1em;
    }
    .subContainer__information {
        font-style: italic;
        font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        font-size: .8em;
    }
    .EmailBody {
        height: 100%;
        width: 100%;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: space-around;
    }
    .EmailBody__contentContainer {
        height: 100%;
        width: 100%;
        display: flex;
        flex-direction: row;
        align-items: center;
        justify-content: space-around;
        flex-wrap: wrap;
        padding-bottom: 2%;
    }
    .contentContainer__subContainer {
        height: 20%;
        display: flex;
        align-items: center;
        justify-content: space-around;
    }
    #ETO {
        height: 80%;
        background-color: #ffffcc;
    }
    #employee {
        height: 40%;
        background-color: #ccffff;
    }
    #approval {
        height: 30%;
        background-color: #ccffcc;
    }
    #name {
        width: 45%;
    }
    #role {
        width: 45%;
    }
    #employeeEmail {
        width: 60%;
    }
    #LeaveStart {
        width: 50%;
    }
    #LeaveEnd {
        width: 50%;
    }
    #ETORequested {
        width: 30%;
    }
    #Manager {
        width: 40%;
    }
    #Reason {
        width: 100%;
        padding-left: 2%;
        flex-direction: column;
        align-items: flex-start;
    }
    #ETOinformation {
        flex-direction: column;
        padding: 0 2% 0 2%;
        justify-content: center;
        height: 20%;
        width: 100%;
        text-align: center;
    }
</style>
<div class="EmailBody">
<h1 class="EmailBody__sectionTitle">Employee Information</h1>

<div class="EmailBody__contentContainer" id="employee">
<div class="contentContainer__subContainer" id="name">
<p class="subContainer__label">Employee Name:</p>

<p class="subContainer__data">[Employee - Candidate - First & Last Name]</p>
</div>

<div class="contentContainer__subContainer" id="role">
<p class="subContainer__label">Employee Role:</p>

<p class="subContainer__data">[Record - Employee - Candidate - Positions - Title]</p>
</div>

<div class="contentContainer__subContainer" id="employeeEmail">
<p class="subContainer__label">Employee Email:</p>

<p class="subContainer__data">[Record - Employee - Company E-Mail]</p>
</div>
</div>

<hr />
<h1 class="EmailBody__sectionTitle">ETO Request</h1>

<div class="EmailBody__contentContainer" id="ETO">
<div class="contentContainer__subContainer" id="LeaveStart">
<p class="subContainer__label">Leave Starts:</p>

<p class="subContainer__data">[First Leave Day]</p>
</div>

<div class="contentContainer__subContainer" id="LeaveEnd">
<p class="subContainer__label">Leave Ends:</p>

<p class="subContainer__data">[Last Leave Day]</p>
</div>

<div class="contentContainer__subContainer">
<p class="subContainer__label" id="ETORequested">ETO Hours Requested:</p>

<p class="subContainer__data">[Number of ETO Hours Requesting to Use:]</p>
</div>

<div class="contentContainer__subContainer" id="Manager">
<p class="subContainer__label">Employee Manager Email:</p>

<p class="subContainer__data">[Record - Employee - Managers Email:]</p>
</div>

<div class="contentContainer__subContainer" id="Reason">
<p class="subContainer__label">Reason for Leave:</p>

<p class="subContainer__data">[Reason for Leave:]</p>
</div>

<div class="contentContainer__subContainer" id="ETOinformation">
<p class="subContainer__information">Supervisor to indicate approval below. Requests will be sent to HR for verification of eligibility. Approval or Disapproval will be sent to employee after HR action.</p>

<p class="subContainer__information">Eligible employees will recieve PTO for the following federal holidays: Memorial Day, Independence Day, Labor Day, Thanksgiving, Christmas Eve, Christmas Day.<br />
There is no need to submit PTO requests for these days.</p>
</div>
</div>

<hr />
<h1 class="EmailBody__sectionTitle">Approve or Decline</h1>

<div class="EmailBody__contentContainer" id="approval">
<p class="contentContainer__button" id="btn_approve">[Approve]</p>

<p class="contentContainer__button" id="btn_decline">[Decline]</p>
</div>
</div>