.nav {
  background-color: red;
  width: 100%;
  height: 50pt;
}
.nav > h1 {
  color: white;
  text-align: left;
  line-height: 50pt;
  margin-left: 10pt;
  /* margin: 0; */
}
form {
  border: 0.5, black, solid;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 30%;
  padding: 20pt;
}
input[type="submit"] {
  padding: 10pt 30pt;
  margin-left: 30pt;
  font-size: 16px;
  border: 2px solid #999;
  border-radius: 6px;
  background-color: #3f51b5;
  color: white;
  transform: translateX(40%);
  cursor: pointer;
}
.form {
  padding: 20pt;
  border: 0.5pt, black, solid;
  margin-left: 0pt;
  border-radius: 20pt;
  width: 30%;
  margin: 20pt;
  background-color: white;
}
form input {
  padding: 10pt;
  margin: 5pt;
  border-top-left-radius: 20pt;
  border-bottom-right-radius: 20pt;
  border-top-right-radius: 20pt;
  border-bottom-left-radius: 20pt;
  border: 1pt, black, solid;
}
input::outline {
  border: none;
  outline: none;
}
.input {
  position: relative;
  margin: 40px;
  transform: translateX(50%);
  width: 250px;
}

.input input {
  width: 100%;
  padding: 14px 10px;
  font-size: 16px;
  border: 2px solid #999;
  border-radius: 6px;
  outline: none;
  background-color: white;
}

/* Label sobre el borde */
.input label {
  position: absolute;
  top: 50%;
  left: 12px;
  /* transform: translateY(-17%); */
  padding: 0 6px;
  background: white; /* mismo color del fondo */
  color: #777;
  font-size: 16px;
  pointer-events: none;
  transition: 0.3s ease;
}

/* Cuando el input está enfocado o tiene texto */
.input input:focus + label,
.input input:not(:placeholder-shown) + label {
  top: 0;
  font-size: 12px;
  color: #3f51b5;
}

/* Color del borde al enfocar */
.input input:focus {
  border-color: #3f51b5;
}

/* responsive tamaño mediano*/
@media (max-width: 1170px) {
  .form {
    margin-left: 15pt;
    width: 50%;
  }
  .input {
    transform: translateX(30%);
  }
  input[type="submit"] {
    transform: translateX(0%);
  }
}
@media (max-width: 600px) {
  .form {
    margin-left: 15pt;
    width: 85%;
  }
  .input {
    transform: translateX(30%);
  }
}
h1 {
  text-align: center;
}