body {
  margin: 0;
  font-family: sans-serif;
  background: rgb(5, 5, 20);
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  overflow: auto;
  height: auto;
}

head {
  overflow: auto;
  height: auto;
}

input {
  width: 100%;
  padding: 10px;
  margin: 10px 0;
  border: 1px solid #ccc;
  border-radius: 6px;
}
button {
  padding: 10px 20px;
  background-color: rgb(50,50,100);
  color: rgb(225, 225, 225);
  border: none;
  border-radius: 10px;
  cursor: pointer;
  margin-top: 2px;
}
button:hover {
  background-color: rgb(50,50,120);
  border-radius: 50px;
}
button:active {
  box-shadow:  2px 2px rgba(150, 150, 150, 0.4);
}




.container {
  margin-top: 120px;
  margin-bottom: 120px;
  margin-left: 30px;
  margin-right: 30px;
  background: rgb(22,22, 30);
  padding: 30px;
  border-radius: 50px;
  text-align: left;
  width: 750px;
  position: relative;
}
@property --angle{
  syntax: "<angle>";
  initial-value: 0deg;
  inherits: false;

}
.container::after, .container::before{
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  content: "";
  position: absolute;
  height: 100%;
  width: 100%;
  background: red;
  top: 50%;
  left: 50%;
  translate: -50% -50%;
  z-index: -1;
  padding: 5px;
  border-radius: 55px;
  background-image: conic-gradient(from var(--angle),red,yellow,green,blue,red );
  animation: 3s spin linear infinite;
}
.container::before{
  filter: blur(1.5rem);
  opacity: 0.4;
}
@keyframes spin{
  from{
    --angle:0deg;
  }
  to{
    --angle: 360deg;
  }
}

.header_text {
  text-align: center;
  line-height: 0px;
  color: white;
}
.signature {
  text-align: center;
  line-height: 1px;
  color: rgba(100, 100, 100, 1);
}


.IPv4_input_box_in_one_row{
    display: flex;
    gap: 2px;
    width: 350px;
    margin-top: 0px;
    height: 50px;
  }
.IPv4_input_box_in_one_row_top_text {
    text-align: left;
    color: rgb(225, 225, 225);
    line-height: 5px;
    margin-bottom: 0px;
}
.IPv4_input_box_style {
  background-color: rgb(22,22, 22);
  color: rgb(225, 225, 225);
  border-color:  rgb(50,50,70);
  border-width: 2px;
  font-size: 22px;
} 
.IPv4_input_box_in_one_row_top_text_2 {
  text-align: left;
  color: rgb(225, 225, 225);
  line-height: 5px;
  margin-bottom: 10px;
}
.IPv4_bold_font_for_prefix {
  text-align: left;
  color: rgb(225, 225, 225);
  line-height: 5px;
  margin-bottom: 5px;
  font-size: 25px;
}





.input_total_number_of_lan_wan {
  width: 150px;
  background-color: rgb(22,22, 22);
  color: rgb(225, 225, 225);
  border-color:  rgb(50,50,70);
  border-width: 2px;
  margin-bottom: 5px;
  margin-top: 10px;
  font-size: 20px;
  height: 15px;
  width: 100px;
}



#network_size_input_boxes_container {
  display: flex;
  flex-wrap: wrap; 
  gap: 20px; 
}
.input_network_size_row {
  display: flex;
  color: white;
  align-items: center;
  gap: 5px;
  margin-bottom: 0px;
}
.input_network_size_box {
  width: 60px;
  height: 10px;
  background-color: rgb(22,22, 22);
  color: rgb(225, 225, 225);
  border-color:  rgb(50,50,70);
  border-width: 2px;
  font-size: 20px;
}






.input_login_box{
  width: 150px;
  height: 20px;
  margin-top: 0px;
  margin-bottom: 5px;
  background-color: rgb(22,22, 22);
  color: rgb(225, 225, 225);
  border-color:  rgb(50,50,70);
  border-width: 2px;
  font-size: 18px;
}







.table_box_text {
  color: rgb(225, 225, 225);
  border: 1px solid white;
  padding: 15px;
  text-align: center;
  border-color:  rgb(50,50,70);
  border-width: 2px;
}

.vlsm_table {
  border-collapse: collapse;
  margin-top: 15px;
  background-color: rgb(22,22, 22);
  color: rgb(225, 225, 225);
}




.error_text {
  color: red;
  font-size: 25px;
  text-align: center;
}