.modal-mensagem {
    position: absolute;
    top: 10%;
    bottom: 0;
    left: 0;
    z-index: 999910040;
    overflow: auto;
    overflow-y: auto;
}
.modal-backdrop {
    z-index: -1;
    visibility:hidden;
}
.modal-footer {
   background-color: #ffffff; 
}
.modal-body {
    background-color: #ffffff;
}
.modal-content {
    top: 100px;
    bottom: 0;
    right: 0px;
    left: 0;
    line-height: 20px;
    z-index: 999910040;
}
.modal-header .mensagem-title1 {
    font-weight: bold;
    font-size: 13px;
}