#adventskalender {
            width: 100%;
            background-image: url(../../../images/adventskalender/background2.png);
            background-repeat: repeat;
            background-position: center center;
            box-sizing: border-box;
            display: inline-block;
            /* background-size: 100% auto; */
        }
        
        #adventskalender .kalenderbox {
            padding: 31px;
            height: auto;
            width: 100%;
            box-sizing: border-box;
            display: inline-block;
        }
                
        #adventskalender .kalenderbox .tuerchen {
            float: left;
            box-sizing: border-box;
            background: transparent;
            width: 16.6%;
        }
                
        #adventskalender .kalenderbox .tuerchen .zahl {
            border: 2px dashed #dbebf1;
            border-left: 2px solid #dbebf1;
            background-color: #99bfc5;
            position: relative;
            z-index: 2;
            display: block;
            background-repeat: no-repeat;
            text-align: center;
            margin: 5%;
            height: 50%;
            line-height: 130px;
            font-size: 27px;
            opacity: 01;
            color: #f0f9fc;
        }
                
        #adventskalender .kalenderbox .tuerchen .zahl a:link,
        #adventskalender .kalenderbox .tuerchen .zahl a:visited,
        #adventskalender .kalenderbox .tuerchen .zahl a:hover,
        #adventskalender .kalenderbox .tuerchen .zahl a:active{
            color: #fafcf9;
        }
                
        #adventskalender .kalenderbox .open {
            right: 1%;
            position: relative;
            transform: perspective(800px) rotateY(-30deg) translate(-7px,0px);
            color: transparent;
            text-decoration: none;
            transition: none;
            letter-spacing: 0;
            border: 0;
            border-bottom: 0;
        }
                
        #adventskalender .kalenderbox .open:before {
            content: "";
            position: absolute;
            top: 9%;
            right: -7%;
            bottom: 8%;
            left: 5%;
            background-color: rgb(255 255 255 / 45%);
            z-index: 1;
        }
                
        #adventskalender .kalenderbox .closed:hover {
            animation: shake .5s ease-in-out;    
        }
                
        @keyframes shake {
            0% {
                transform: translateX(0);
            }
            
            20% {
                transform: translateX(-10px);
            }
            
            40% {
                transform: translateX(10px);
            }
            
            60% {
                transform: translateX(-10px);
            }
            
            80% {
                transform: translateX(10px);
            }
            
            100% {
                transform: translateX(0);
            }
        }