body {
    /* background-image: url('../assets/sala-de-aula.png'); 
    background-size: 100%;
    background-repeat: no-repeat; */
    right: 0; 
    bottom: 0;
    min-width: 100%; 
    min-height: 100%;
    width: auto; 
    height: auto; 
    z-index: -1000;
    background: url(../assets/banner4.jpg) no-repeat;
    background-size: cover; 
    background-position: center;
}
main {
    display: -ms-flexbox;
    display: flex;
    -ms-flex-align: center;
    align-items: center;
    line-height: 1.2;
}

.form-login {
    width: 100%;
    max-width: 350px;
    padding: 15px;
    margin: auto;
}
.form-login .form-control {
    position: relative;
    box-sizing: border-box;
    height: auto;
    padding: 10px;
    font-size: 16px;
}
.form-login .form-control:focus {
    z-index: 2;
}
.form-login input[type="email"] {
    margin-bottom: -1px;
    border-bottom-right-radius: 0;
    border-bottom-left-radius: 0;
}
.form-login input[type="email2"] {
    margin-bottom: 10px;
}
.form-login input[type="password"] {
    margin-bottom: 10px;
    border-top-left-radius: 0;
    border-top-right-radius: 0;
}