* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}
body {
  font-family: Arial, sans-serif;
  background-image: url("../img/texture.jpg");
  background-repeat: no-repeat;
  background-size: cover;
  background-position: relative;
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 0;
  height: 100vh;
}
img {
  max-width: 200px;
  display: block;
  margin: 0 0.1rem;
}
.container {
  background-color: #ffffff;
  color: black;
  margin-top: 10px;
  border-radius: 5px;
  max-width: 425px;
  margin-left: 10px;
  margin-right: 10px;
  text-align: center;
  padding: 5px 10px;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.4);
  transform: perspective(1000px) rotateX(2deg);
}
.row {
  display: flex;
  max-width: 100%;
  flex-direction: column;
  align-items: center;
  background-color: #010101;
  color: #fff;
  border: 1px solid #eee;
  padding: 2rem;
  border-radius: 5px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
  text-align: center;
}

.row form .input-group input {
  width: 100%;
  font-size: 1.4rem;
  background: none;
  color: #fff;
  border: none;
  border-bottom: 1px solid #eee;
  margin-top: 1rem;
  padding: 1rem;
  position: relative;
}
.row form .btn {
  margin-top: 2rem;
  padding: 1.2rem 2.5rem;
  font-size: 1.7rem;
  color: #fff;
  cursor: pointer;
  border: none;
  transition: background-color 0.3s;
}
.row form .btn:hover {
  background-color: #555;
}
input[type="text"],
button {
  background-color: #008cca;
  border: 1px solid #008cca;
  margin: 1px;
  text-align: center;
  font-size: 16px;
  color: #fff;
  text-shadow: 1px 1px 1px #010101;
  text-decoration: none;
  display: inline-block;
  margin: 5px 1px;
  width: 230px;
  height: 30px;
  cursor: pointer;
  border-radius: 5px;
}
button:hover {
  background-color: #555;
}

/* Style the result spans */
span {
  font-weight: bold;
}
.row form .btn:hover {
  background-color: #555;
}
.tsubnet {
  width: 300px;
  height: 100px;
  border-radius: 5px;
  background: #f1f1f1;
  align-items: center;
  justify-content: center;
}
.tsubnet th {
  background-color: #008cca;
  color: #fff;
  font-weight: bold;
  padding: 10px;
  text-align: center;
  text-shadow: 1px 1px 1px #010101;
}
.tsubnet td {
  border: 1px solid #dddddd;
  text-align: left;
  padding: 5px;
  color: #000;
}
.tsubnet tr:nth-child(even) {
  background-color: #f2f2f2;
}
.footer-copyright {
  color: #fff;
  padding: 5px 10px;
  text-align: center;
}

.footer-copyright-wrapper {
  margin-left: auto;
  margin-right: auto;
  max-width: 1200px;
}

.footer-copyright-text {
  color: #fff;
  font-size: 12px;
  font-weight: normal;
  line-height: 18px;
  letter-spacing: 1px;
  margin-bottom: 0;
  margin-top: 0;
}

.footer-copyright-link {
  color: #fff;
  text-decoration: none;
}
/* Laptop */
@media (max-width: 1366px) {
  html {
    font-size: 75%;
  }
}
/* Tablet */
@media (max-width: 768px) {
  html {
    font-size: 62.5%;
  }
  .container {
    width: 100%;
  }
  .row {
    flex-wrap: wrap;
    text-align: center;
  }
}
/* Mobile Phone */
@media (max-width: 450px) {
  html {
    font-size: 55%;
  }
}