@import url("https://fonts.googleapis.com/css2?family=Open+Sans:wght@300&display=swap");

:root {
  --primary-color: #60a5fa;
  --off-white: white;
  --hover: #e6e6e6;
}

body {
  font-family: "Open Sans", sans-serif;
  background: linear-gradient(#0077b6, #90e0ef);
  background-attachment: fixed;
  margin: 0;
  padding: 0;
}

nav {
  color: var(--off-white);
  padding: 1rem;
}
nav ul {
  list-style: none;
  text-align: center;
}
nav li {
  padding: 1rem 1rem;
  display: inline;
}

nav a {
  color: var(--off-white);
  text-decoration: none;
  font-weight: 900;
  font-size: large;
}
nav li a:hover {
  color: #1e3a8a;
  font-weight: bold;
  transition: 0.5s;
}
.main {
  width: 100%;
  max-width: 500px;
  margin: auto;
  padding: 2rem 1rem;
  text-align: center;
  box-sizing: border-box;
  color: #ffffff;
}

input[type="number"] {
  width: 80%;
  margin: 10px;
  height: 40px;
}
label {
  font-weight: 700;
}
p {
  font-weight: 900;
}
button {
  cursor: pointer;
  color: white;
  outline: none;
  border: none;
  font-weight: 700;
  border-radius: 0.2rem;
  padding-left: 2rem;
  padding-right: 2rem;
  margin-right: 1rem;
  margin-top: 1rem;
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
  background-color: var(--primary-color);
}

button:hover {
  background-color: var(--hover);
  transition: all 0.2s;
}
.output {
  font-weight: 900;
  color: red;
  margin-top: 20px;
}

.footer {
  width: 100%;
  text-align: center;
  box-sizing: border-box;
  border-radius: 20px;
  color: #ffffff;
  margin-bottom: 5px;
}
.footer a {
  margin: 3px;
  padding: 3px;
}
.footer i {
  color: #ffffff;
}

footer i:hover {
  color: #1e3a8a;
}

.backbtn {
  display: none;
}
@media screen and (max-width: 600px) {
  input[type="number"] {
    width: 70%;
    margin: 10px;
    height: 40px;
  }
  nav {
    display: none;
  }
  .backbtn {
    padding-top: 2rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    color: var(--off-white);
    font-weight: 900;
    font-size: large;
  }
  .backbtn:hover {
    color: #1e3a8a;
    font-weight: bold;
    transition: 0.5s;
  }
}