html, body {
    height: 100%;
}

body {
    margin: 0;
    padding: 0;
    text-align: center;
    color: #231F20;
    font-family: Tahoma !important;
    font-size: 12px;
    background: #acacac;
}

#tudo {
    width: 100%;
    position: relative; /*Contexto de posicionamento */
    margin: 0 auto;
    text-align: left;
    min-height: 100%; /**/
}

* html #tudo {
    height: 100%;
}

#topo {
    width: 100%;
    height: 32px;
    text-align: left;
    padding-top: 1px;
}

#principal {
    text-align: center;
    margin: 0;
}

#rodape {
    width: 100%;
    height: 168px;
    position: absolute;
    bottom: -174px;
    text-align: center;
    color: #231F20;
}

#rodape p {
        margin: 0;
        font-weight: bold;
}

.clear {
    clear: both;
}

.divLogin {
    width: 100%;
    padding-top: 385px;
    text-align: center;
}

.divBotao {
    height: 80px;
    margin-bottom: 70px;
}

.lnkPortalProfessor {
    background-image: url("../imagens/botao-port-professor.png");
    background-position: center;
    background-repeat: no-repeat;
    padding-top: 50px;
    padding-bottom: 50px;
    padding-left: 1000px;
    color: #231F20;
    text-decoration: none;
    height: auto;
}

.lnkPortalAluno {
    background-image: url("../imagens/botao-port-aluno.png");
    background-position: left center;
    background-repeat: no-repeat;
    padding-top: 50px;
    padding-bottom: auto;
    padding-right: 50px;
    padding-left: 130px;
    color: #231F20;
    text-decoration: none;
    height: auto;
}

.lnkPortalGestor {
    background-image: url("../imagens/botao-port-gestor.png");
    background-position: left center;
    background-repeat: no-repeat;
    padding-top: 50px;
    padding-bottom: auto;
    padding-right: 50px;
    padding-left: 210px;
    color: #231F20;
    text-decoration: none;
    height: auto;
}

.edtLogin {
    background-color: #F9F9F9;
    border: 1px solid #E5E5E5;
    font-size: 20px;
    line-height: 30px;
}