body {
    padding-top: 40px;
    padding-bottom: 40px;
    background-color: #eee;
    background-image: url('../imagens/imagem_fundo_02.jpg');
    background-position: center top;
    background-repeat: no-repeat;
    background-size: cover;
    min-height: 100%;
}

.form-signin {
  max-width: 330px;
  padding: 15px;
  margin: 0 auto;
}
.form-signin .form-signin-heading,
.form-signin .checkbox {
  margin-bottom: 10px;
}
.form-signin .checkbox {
  font-weight: normal;
}
.form-signin .form-control {
  position: relative;
  height: auto;
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
  padding: 10px;
  font-size: 16px;
}
.form-signin .form-control:focus {
  z-index: 2;
}
.form-signin input[type="email"] {
  margin-bottom: -1px;
  border-bottom-right-radius: 0;
  border-bottom-left-radius: 0;
}
.form-signin input[type="password"] {
  margin-bottom: 10px;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
}
.panel-login
{
    padding:10px;
    background-color:azure;
}

@media screen and (max-width: 1024px) {
    body {
        padding-top: 40px;
        padding-bottom: 40px;
        background-color: #eee;
        background-image: url('../imagens/imagem_fundo_02_mobile.jpg');
        background-position: center top;
        background-repeat: no-repeat;
        background-size: cover;
        min-height: 100%;
    }
}