* {
    margin: 0;
    padding: 0;
    text-decoration: none;
    font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
}

body {
    background-image: url('../img/bg4.jpg');;
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center;
    background-attachment: fixed;
}


/* DiseƱar lo formularios */

main {
    width: 100%;
    padding: 20px;
    margin: auto;
    margin-top: 100px;
}

.contenedor_todo {
    width: 100%;
    max-width: 800px;
    margin: auto;
    position: relative;
}


/* Caja trasera */

.caja_trasera {
    width: 100%;
    padding: 10px 20px;
    display: flex;
    justify-content: center;
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    background-color: rgba(19, 35, 48, 0.644);
}

.caja_trasera div {
    margin: 100px 40px;
    color: rgb(218, 240, 248);
    transition: all 500ms;
}

.caja_trasera button {
    margin-top: 30px;
}

.caja_trasera div h3 {
    font-weight: 400;
    font-size: 26px;
}

.caja_trasera div p {
    font-weight: 300;
    font-size: 16px;
}

.caja_trasera button {
    padding: 10px 40px;
    border: 2px solid #ece2e2;
    font-size: 14px;
    background-color: transparent;
    font-weight: 600;
    cursor: pointer;
    color: #d1e7fd;
    outline: none;
    transition: 300ms;
    /* aplicar efecto al boton */
}

.caja_trasera button:hover {
    background: rgba(184, 231, 227, 0.753);
    color: #01162b;
}

.contenedor_login_register {
    display: flex;
    align-items: center;
    width: 100%;
    max-width: 380px;
    position: relative;
    top: -185;
    left: 10px;
    transition: left 500ms cubic-bezier(0.175, 0.885, 0.320, 1.275);
}

.contenedor_login_register form {
    width: 100%;
    padding: 80px 20px;
    background: rgb(19, 35, 48);
    position: absolute;
    border-radius: 20px;
}

.contenedor_login_register form h2 {
    font-size: 30px;
    text-align: center;
    margin-bottom: 20px;
    color: #84a1b3;
}

.contenedor_login_register form input {
    width: 100%;
    margin-top: 20px;
    padding: 10px 5px;
    border: none;
    background: rgb(236, 247, 250);
    font-size: 16px;
    outline: none;
}

.contenedor_login_register form button {
    padding: 10px 20px;
    margin-top: 40px;
    border: none;
    font-size: 14px;
    background: #84a1b3;
    font-weight: 600;
    cursor: pointer;
    color: rgb(37, 37, 37);
    outline: none;
}

.formulario_login {
    opacity: 1;
    display: block;
}

.formulario_register {
    display: none;
}

@media screen and (max-width:850px) {
    main {
        margin-top: 50px;
        .caja_trasera {
            max-width: 350px;
            height: 300px;
            flex-direction: column;
            margin: auto;
        }
        .caja_trasera div {
            margin: 0;
            position: absolute;
        }
        .contenedor_login_register {
            top: -10px;
            left: -5px;
            margin: auto;
        }
        .contenedor_login_register form {
            position: relative;
        }
    }
}