JSFiddle - React, Tailwind, and code Playground

HTML

<div class="col-md-9 col-md-offset-3 reg-login-line">
					                    <div class="onoff">
                        <input type="checkbox" autocomplete="off" id="register_account" name="register_account" checked="checked" value="1" onclick="return Onepage.showFields( this.checked, new Array('opc_password', 'opc_password2') );">
                        <label for="register_account"></label>
                    </div>

                    <label for="register_account" class="as-text">Зарегистрироваться</label>
                </div>

CSS

*{
  box-sizing:border-box;
}
.onoff {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    display: inline-block;
    width:auto;
    margin:0 0.3em 0 0;
    padding:0;
}

.onoff input{
    display: none;
}

.onoff label {
    overflow: hidden;
    cursor: pointer;
    height: 24px;
    padding: 0;
    line-height: 20px;
    border: 1px solid #ddd;
    border-radius: 20px;
    background-color: #FFFFFF;
    transition: background-color 0.25s ease;
    margin: 0;
    width:37px;
    position:relative;
    display:inline-block;
}

.onoff label:before {
    content: "";
    display: block;
    width: 20px;
    height: 20px;
    margin: 0px;
    background: #FFFFFF;
    position: absolute;
    top: 1px;
    bottom: 0;
    right: 14px;
    border: 0;
    -webkit-border-radius: 20px;
    -moz-border-radius: 20px;
    border-radius: 20px;
    transition: right 0.25s ease;
    -webkit-box-shadow: 0 2px 3px 0px rgba(0, 0, 0, 0.3);
    -moz-box-shadow: 0 2px 3px 0px rgba(0, 0, 0, 0.3);
    box-shadow: 0 2px 3px 0px rgba(0, 0, 0, 0.3);
}

.onoff input:checked + label{
    background-color: #49E845;
}

.onoff input:checked + label:before {
    right: 1px;
}