html, body { height: 100%; }
body {
    margin: 0;
    padding: 0;
    
            } 
            .izquierda {
                
                background-size: cover;
                background-position: center;
                width: 50%;
                height: 100vh;
               
            }
            .derecha{
                background: #FFFFFF;
                height: 100vh;
                width: 50%;
                justify-content: center;
                align-items: center;
            }
    
            #pantalla-dividida {
                display: flex;
            }
h5 { font-size: 0.875rem; }
.form-login {
    width: 100%;
    max-width: 410px;
    padding: 35px;
    margin: 0 auto;
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 10px 60px 0 rgba(29,29,31,.09);
    box-sizing: border-box;
}
.form-login label {
    color: #888ea8;
    text-transform: uppercase;
    font-size: 13px;
}
.form-login .form-control {
    position: relative;
    box-sizing: border-box;
    height: auto;
    padding: 3px;
    font-size: 16px;
    border: none;
    background: transparent;
    border-bottom: 1px solid #e9ecef;
     
}
.form-login .form-control::-webkit-input-placeholder {
    color: #3862f5;
    font-size: 14px;
    opacity: 0;
}
.form-login .form-control::-ms-input-placeholder {
    color: #3862f5;
    font-size: 14px;
    opacity: 0;
}
.form-login .form-control::-moz-placeholder {
    color: #3862f5;
    font-size: 14px;
    opacity: 0;
}
.form-login .form-control:focus { z-index: 2; }
.form-login .checkbox .custom-control label {
    color: #3b3f5c;
    text-transform: capitalize;
    font-size: 14px;
}
.form-login .forgot-pass a {
    color: #015865;
    /*text-transform: lowercase;*/
    font-size: 13px;
    margin-left: -17px;
}
.form-login .social-icons h5 {
    color: #494949;
    font-weight: 600;
}

/* Mobile: pantalla dividida y formulario */
@media (max-width: 991px) {
    #pantalla-dividida {
        flex-direction: column;
    }
    .izquierda {
        width: 100%;
        min-height: 0;
        height: auto;
        max-height: 40vh;
    }
    .derecha {
        width: 100%;
        min-height: 60vh;
    }
    .form-login {
        max-width: 100%;
        padding: 12px 16px;
        box-sizing: border-box;
    }
}