body {
  margin: 0;
  padding: 0;
  background-image: url("../imagenes/ibcs fondo.jpg");
  background-repeat: no-repeat;
  background-size: cover;
  background-attachment: fixed;
  font-family: sans-serif;
  height: 100vh;
}

.login-box {
  width: 320px;
  height: 420px;
  background: #000;
  border-radius: 5%;
  color: #fff;
  top: 50%;
  left: 50%;
  position: absolute;
  transform: translate(-50%, -50%);
  box-sizing: border-box;
  padding: 70px 30px;
}

.login-box .avatar {
  height: 100px;
  border-radius: 5%;
  position: absolute;
  top: -50px;
  left: calc(35% - 50px);
  width: 205px;
}

.login-box h1 {
  margin: 0;
  padding: 0 0 20px;
  text-align: center;
  font-size: 22px;
}

.login-box label {
  margin: 0;
  padding: 5px;
  display: block;
}

.login-box input {
  width: 100%;
  margin-bottom: 20px;
}

.login-box button {
  width: 100%;
  margin-bottom: 20px;
}

.login-box input[type="text"],
.login-box input[type="password"] {
  border: none;
  border-bottom: 1px solid #fff;
  background: White;
  outline: none;
  height: 50px;
  color: black;
  font-size: 16px;
}

.login-box a {
  text-decoration: none;
  font-size: 12px;
  line-height: 20px;
  color: darkgrey;
}

.login-box a:hover {
  color: #fff;
}
.login-box button[type="submit"]:hover {
  background-color: #0d6efd;
  color: #fff;
}

.botonlogin {
  color: #318aac !important;
  font-size: 12px;
  font-weight: 500;
  padding: 0.5em 1.2em;
  background: rgba(0, 0, 0, 0);
  border: 2px solid;
  border-color: #318aac;
  transition: all 1s ease;
  position: relative;
}
.botonlogin:hover {
  background: #318aac;
  color: #fff !important;
  box-shadow: 0 12px 16px 0 rgba(0,0,0,0.24), 0 17px 50px 0 rgba(0,0,0,0.19);
}

@media screen and (max-width: 760px) {
    
body {
  margin: 0;
  padding: 0;
  background-image: url("../imagenes/ibcs fondo celular.jpg");
  background-repeat: no-repeat;
  background-size: cover;
  background-attachment: fixed;
  font-family: sans-serif;
  height: 100vh;
}

}