html,body{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    overflow-x: hidden;
    scroll-behavior: smooth;
}

.must-icon{
    position: relative;
}
.must-icon::after {
	content: "必須";
    display: inline-block;
	color: #fff;
    background-color: #e09023;
	padding: 0.1rem 0.4rem;
    margin-left: 0.4rem;
	font-size: 0.7rem;
    border-radius: 4px;
    vertical-align: text-top;
    position: absolute;
    right: 1rem;
    top: 0.6rem;
}