Change outline style submit button on hover

Site URL: https://www.swalsh.art/contact

I am having a problem changing the hover color of the submit button on this form. I would like to have the outline style button in white, then for it to be a pink (F551CC) outline on hover. This is the code I'm trying to use: 

.form-wrapper input[type=submit]:hover {
  background:transparent!important;
  border:2px solid #F551CC!important;
}

I can't get the hover state to change from a white background with pink text. Can anyone help?

Add to Page SEttings > Advanced > Header

<style>
  .primary-button-style-outline .dark .sqs-block-form .sqs-editable-button:hover {
    border: 2px solid pink !important;
}
</style>