.back-dialog{
    width:100%;
    height:100%;
    background-color: rgba(0,0,0,0.5);
    background-size:1920px 1080px;
    position: relative;
    left:0;
    right:0;
    top:0;
    overflow:hidden;
    position:fixed;
}
/* Позиционируем блок с контентом */
.dialog-content{
    position: absolute;
    overflow: hidden;
    overflow-y: auto;
    padding: 10px;
    margin:40px auto 0px auto;
    width:300px;
    max-height: 300px;
    padding-bottom: 10px;
    background-repeat: no-repeat;
    background-image: url(/images/leather.jpg); 
    background-position: 50% 50%;
    border-radius: 0 0 5 5;
    left:1%;
    right:1%;
    top:50%;
    margin-top:-150px;
    border: 2px solid #4b4a4a;
}
/* Позиционируем верхний бар */
.dialog-title{
    margin: 0 -10 0 -10;
    margin-bottom:5px;
    text-align: center;
    position: relative;
    height: 30px;
    background-color: #333;
    color: #fff;
    border: 2px solid #4b4a4a;
}

.dialog-title span{
    font-size: 25px;
    padding-left: 10px;
}
/* Делаем кнопку закрытия окна */
.close-dialog{
    position: absolute;
    right: 0;
    top: 0;
    text-align: center;
    color: #fff;
    height: 30px;
    width: 30px;
    border:0;
    text-decoration: none;
}

.close-dialog:before{
    font-family: Arial;
    color: rgba(255, 255, 255, 0.9);
    content: "x";
    font-size: 25px;
    text-shadow: 0 -1px rgba(0, 0, 0, 0.5);
    outline: none;
}