tag – Error

Good day,

we are using Quantcast with our website in order to receive consent before tracking usage or showing ads. However when inserting the code for the styling of the permanent consent button we receive a google error that tells us, that the tag “style amp-custom” is present several times in the document and we have to fix it. Do you know how we can still adjust the button for the settings, but not get the error? The code which is included via the head html field is:

<style amp-custom>
#postPromptUI button {
background: #368bd6;
color: white;
padding: 5px 15px;
border: none;
outline: none;
display: flex;
align-items: center;
position: fixed;
right: 0;
bottom: 0;
border-radius: 3px 0 0 3px;
max-height: 30px;
max-width: 110px;
cursor: pointer;
}
</style>

Thank you so much in advance!