.readmore-wrap{position:relative}
.readmore-content{max-height:100vh;overflow:hidden;position:relative;transition:max-height .4s ease}
.readmore-content::after{content:"";position:absolute;left:0;right:0;bottom:0;height:80px;background:linear-gradient(to bottom,rgba(255,255,255,0),#fff)}
.readmore-wrap.open .readmore-content{max-height:none}
.readmore-wrap.open .readmore-content::after{display:none}
.readmore-btn{text-align:center;margin:16px auto 0;color:#1677ff;cursor:pointer;font-size:14px}
.readmore-btn .arrow{display:inline-block;margin-left:6px;border:solid currentColor;border-width:0 1px 1px 0;padding:3px;transform:rotate(45deg);transition:transform .3s}
.readmore-wrap.open .readmore-btn .arrow{transform:rotate(-135deg)}