Custom radio button CSS

HTML

<input type="checkbox" /> Radio Button2

CSS

input[type="checkbox"] {
    -webkit-appearance: none;
    appearance: none;
    width: 15px; height: 15px;
    border:1px solid #2597d8;
    border-radius: 50%;
    background-color: #fff;
    outline: 0;
}

input[type="checkbox"]:checked {
    background-color: #2597d8;
}