*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
h3{
    font-family: 'Arial';
    font-size: 25px;
    letter-spacing: 1px;
    width: 100%;
    background: #0077c5; /* Fondo azul */
    padding: 15px;
    color: #FFF;
    text-align: center;
    text-transform: uppercase;
}
#container{
    background: #FF5733; /* Fondo azul claro */
    width: 100%;
    height: 100vh;
    display: -webkit-flex;
    display: -moz-flex;
    display: -ms-flex;
    display: -o-flex;
    display: flex;
    justify-content: center;
    align-items: center;
}

#container form{
    background: #f0debb;
    width: 400px;
    padding: 10px;
}

#container form img{
    margin: 15px auto;
    text-align: center;
    display: block;
}
#container form input{
    width: 90%;
    padding: 5px;
    font-size: 16px;
    display: block;
    margin: 25px auto;
    border-radius: 5px;
    border: 1px solid #0077c5; /* Borde azul */
    text-align: center;
}

#container form input[type="submit"]{
    background: #FF5733;; /* Fondo azul */
    padding: 10px;
    color: #FFF; /* Texto blanco */
    letter-spacing: 1px;
    border: 0;
    cursor: pointer;
}
.alert{
    font-family: 'Arial';
    font-size: 16px;
    text-align: center;
    color: #0077c5; /* Texto azul */
}