mail_css.html

<style>
textarea {
    resize: none;
}

html{
    overflow-y:overlay;
}

::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
 	-webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.3);
	border-radius: 5px;
	background-color: #F5F5F5;
}
 
::-webkit-scrollbar-thumb {
    border-radius: 5px;
	-webkit-box-shadow: inset 0 0 6px rgba(0,0,0,.3);
	background-color: #a5a5a5;
}

::-webkit-scrollbar-thumb:hover {
    background: #555; 
}

::placeholder { /* Chrome, Firefox, Opera, Safari 10.1+ */
    color: red !important;
    opacity: .5; /* Firefox */
}
</style>