All credits to Robert Petitto.

<pre><span><style>

[data-test="app-inline-picker"] {
background: none;
}

[data-test="app-inline-picker"] ::after{
display: none;
}

[data-test="app-inline-picker"] .current {
background-color: transparent;
border-bottom: #5B00A5 solid 2px;
margin-bottom: -4px;
border-radius: 0px;
box-shadow: none !important;
}