body {
  font-family: 'Segoe UI Semilight','Segoe UI','Microsoft Yahei',Tahoma,Arial,sans-serif,Helvetica, "Helvetica Neue", Helvetica,  Hiragino Sans GB, WenQuanYi Micro Hei, sans-serif;
}

.btn {
 border-radius:0px;
}
.form-control {
 border-radius:0px;
}

.red{color:red}
.req:after { content: "*"; color:red}

 .circle{   
      width: 10px;      
      height:10px;       
       border-radius: 50%;    
       display:inline-block;    
  }  

.busy{ background-color:red}
.free { background-color:green}
.out { background-color:gray}