body {
    margin: 0;
    padding: 0;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 12px;
    background: url('../img/background.png') no-repeat center center fixed;
    background-size: cover;
    height: 100vh;
}


.formulario {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    border-radius: 40px;
    border-color: #791726;
    border-width: 80px;
}

.formulario h1 {
    text-align: center;
    padding: 0 0 20px 0;
    border-bottom: 1px solid silver;

}

.formulario form {
    padding: 0 40px;
    box-sizing: border-box;
}

form .username {
    position: relative;
    border-bottom: 2px solid #6e0505;
    margin: 30px 0;
}

.username input {
    width: 100%;
    padding: 0 5px;
    height: 40px;
    ;
    font-size: 16px;
    border: none;
    background: none;
    outline: none;
}

.username label {
    position: absolute;
    top: 50%;
    left: 5px;
    color: #791726;
    font-family: Arial, Helvetica, sans-serif;
    font-weight: bold;
    visibility: hidden;
    transform: translateY(-50%);
    font-size: 16px;
    pointer-events: none;
    transition: .2s;
}

.username span::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 0;
    width: 0%;
    height: 2px;
    background: #791726;
    transition: .5s;

}

.username input:focus~label,
.username input:focus~label {
    top: -5px;
    visibility: visible;
}

.username input:focus~span::before,
.username input:focus~span::before {
    width: 100%;
}

.recordar {
    margin: -5px 0 20px 5px;
    color: blue;
    cursor: pointer;
}

.recordar:hover {
    text-decoration: underline;
}

input[type="submit"] {
    width: 100%;
    height: 50px;
    border: 1px solid;
    background: #791726;
    border-radius: 25px;
    font-size: 18px;
    color: white;
    cursor: pointer;
    outline: none;
}

input[type="submit"]:hover {
    border-color: #0c0103;
    transition: 05s;
}

.registrarse {
    margin: 30px 0;
    text-align: center;
    font-size: 16px;
    color: #791726;
}

.registrarse a {
    color: blue;
    text-decoration: none;
}

.registrarse a:hover {
    text-decoration: underline;
}