html {
    font-size: 10px;
    font-family: sans-serif;
}
a.btn-voltar {    
    border-radius: 3px;    
    box-shadow: none;
    border: 1px solid transparent;
    position: relative;
    padding-left: 44px;
    text-align: left;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    background-color: #3c8dbc;
    border-color: #367fa9;    
    color: #fff;
    display: inline-block;
    margin-bottom: 0;
    font-weight: 400;    
    touch-action: manipulation;
    cursor: pointer;
    background-image: none;
    padding: 6px 12px;
    font-size: 14px;
    line-height: 1.42857143;
    user-select: none;
    /*vertical-align: middle;
    float: center!important;*/
}
.externa{
    display:flex;
    justify-content:center;
    width:100%;
    height:auto;
}
DIV.interna {
    min-height: 10em;
    display: table-cell;
    vertical-align: middle }
.bg-aqua {   
    background: #00c0ef;    
}
p.txt-erro {
    text-align: center;
    font-size: 30px;
}
.container {
    margin-top: 10%;
}