*{
    margin: 0;
    padding: 0;
    font-family: sans-serif;
    box-sizing: border-box;
}
body {
    /*background: #DEDEDE;*/
    background-image: url(images/fondo2.jpg);
    background-position: center center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-size: cover;
    background-color: #464646;
    
    display: flex;
    min-height: 100vh;
}
form {
    margin: auto;
    width: 50%;
    max-width: 500px;
    background: #d8cece;
    padding: 30px;
    border: 4px solid #3b1207;
    
    
}
h2{
    text-align: center;
    margin-bottom: 20px;
}
input{
    display: block;
    padding: 10px;
    width: 100%;
    margin: 30px 0;
    font-size: 20px;
}
input[type="submit"]{
    background: linear-gradient(#DB3C15, #DB3C15);
    border: 0;
    color: #23272a;
    opacity: 0.8;
    cursor: pointer;
    border-radius: 20px;
    margin-bottom: 0;
}

input[type="submit"]:hover{
    opacity: 1;
}
input[type="submit"]:active{/*cuando se hace clic*/
    transform: scale(0.9);
}

input[type="button"]{
    background: linear-gradient(#0026a3,#0026a3);
    border: 0;
    opacity: 0.8;
    cursor: pointer;
    margin-bottom: 0;
}
input[type="button"]:hover{
    opacity: 1;
}
input[type="button"]:active{
    transform: scale(0.9);
}

@media (max-width:768px){
    form{
        width: 75%;
        
    }
}
@media (max-width:480px){/*validar */
    form{
        width: 95%;
        
    }
}