body {

    background-image: url(../imagenes/avion3.jpg);
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center;
    background-attachment: fixed;
}
main {
    width: 100%;
    margin: 0 auto;
    margin-top: 125px ;
    max-width: 1370px;
}
.contenedor__todo{
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}
.caja__trasera{ 
    width: 100%;
    display: flex;
    justify-content: center;
    backdrop-filter: blur(10px);
    background-color: rgba(0, 128, 255, 0.5);
     border-radius: 0.9em;
}
.caja__trasera div{
    margin: 100px 80px;
    color: white;
    transition: all 500ms;
    text-align: center;/*para centrar los botones*/

}
.caja__trasera div p,
.caja__trasera div button {
    margin-top: 30px;
}
.caja__trasera div h3 {
    font-weight: 400;
    font-size: 26px
}
.caja__trasera div button {
    display: inline-block;
    background: white;
    padding: 10px 45px;
    color: #0e3a5d;
    border: 0 none;
    font-size: 18px;
    cursor: pointer;
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    border-radius: 1em;

}
.caja__trasera div button:hover {
    background: #fff;
    color: #0d3b5b;
    opacity: .9;
}
/*Formularios */
.contenedor__login-register{
    display: flex;
    align-items: center;
    width: 100%;
    max-width: 380px;
    position: relative;
    top: -185px;
    left:250px;
    transition: left 500ms cubic-bezier(0.175,0.885, 0.320, 1.27);
}
.contenedor__login-register b{
    color:#0c231e;
}
.contenedor__login-register form {
    width: 100%;
    padding: 30px 20px;
    background:#fff;
    position: absolute;
    border-radius: 20px;
}
.contenedor__login-register form button{
    display: inline-block;
    background: #0e3a5d;
    padding: 5px 15px;
    color: white;
    border: 0 none;
    font-size: 18px;
    cursor: pointer;
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    border-radius: 5px;
    border-radius: 1em;
    margin: 0 auto ;
}
.formulario__tecnico{
    display: none; /*no aparece le formulario registro*/
    height: 370px;
    margin-left: 2.3em;
}
.formulario__login{
   height: 370px;
   margin-left: 2.3em;
    opacity: 1;
    display: none; /*display: block;*/
}
.formulario__registro{
    display: none; /*no aparece le formulario registro*/
    height: 370px;
    margin-left: 3em;
}
.formulario__tecnico{
    
}
/*trabjando en el responsive design*/
@media scree and (max-width:850px){
main{
    margin-top: 50px;
}
.caja__trasera{
    max-width: 350px;
    height: 300px;
    flex-direction: column;
    margin: auto;
}
.caja__trasera div{
    margin: 0px;
    position: absolute;
}
.contenedor__login-register{
    top:-10px;
    left:-5px;
    margin:auto ;
}
.contenedor__login-register form{
    position: relative;
}

}
@media (min-width: 768px){
.col-sm-offset-0 {
    margin-left: 0;
    margin-top: 0.5em;
}
.modal-body{
    padding: 0;
    margin: 0;
    border-top: 3px solid #bc955a;
}
.modal-header{
    margin: 0;
    padding: 0;
}
.form-body input{
    background: transparent;
}
}