To change the appearance of the select dropdown arrow in an HTML, you can use CSS to target the select element and add a custom arrow. For example, the following CSS code will change the arrow:
select {
-webkit-appearance: none;
-moz-appearance: none;
background: transparent;
background-image: url("data:image/svg+xml;utf8,<svg fill='black' height='24' viewBox='0 0 24 24' width='24' xmlns='http://www.w3.org/2000/svg'><path d='M7 10l5 5 5-5z'/><path d='M0 0h24v24H0z' fill='none'/></svg>");
background-repeat: no-repeat;
background-position-x: 100%;
background-position-y: 5px;
border: 1px solid #dfdfdf;
border-radius: 2px;
margin-right: 2rem;
padding: .7rem;
padding-right: 2rem;
}
Note that you need to put the CSS code in your CSS file and make sure the -webkit-appearance/-moz-appearance is none.