@font-face {
    font-family: "KHGummi";
    src: url(../main/KHGummi.otf);
    font-family: "KHMenu";
    src: url(../main/KHMenu.otf);
}
header{
    margin: auto;
    text-align: center;
    font-size: 20px;
}
body {
    background-image: url(../main/back.png);
    background-size: 15px;
    background-color: rgba(50, 255, 255, 0.527);
    background-blend-mode: multiply;
    font-family: 'KHGummi';
    margin: 0;
    padding: 0;
    font-size: 16px;
}
.container_box{
    margin: auto;
    box-sizing: content-box;
    min-width: 600px;
    max-width: 800px;
    min-height: 250px;
    background-color: rgba(128, 128, 128, 0.74);
    box-shadow: 10px 10px rgba(0, 0, 0, 0.377);
}

.footer{
    text-align: center;
}
.nav_1{
    background-color: rgb(0, 132, 255);
    color: rgb(0, 0, 0);
    margin: auto;
    box-sizing: content-box;
    width: 500px;
    box-shadow: 5px 5px;
    text-align: center;
    
}
ul{
    list-style: none;
    display: flex;
    gap: 25px;
    padding: 15px;
    margin: 2px;
}

.main_topic{
    padding: 5px;
    font-size: 30px;
    text-align: center;
}
.text_1{
    padding: 5px;
    font-family: "KHMenu";
    font-size: 16px;
}
.sub_topic{
    padding: 5px;
    font-size: 25px;
    text-align: center;
}
.sub_text{
    padding: 5px;
    font-family: "KHMenu";
    font-size: 16px;
}


a {  
  color: rgb(255, 255, 255);    
  text-decoration: none;
  transition: transform 0.4s, opacity 0.2s;
}

a:hover {
  opacity: 0.5;
  transform: scale(1.5);          
}
.goodbye{
    padding: 5px;
    font-size: 30px;
    text-align: center;
}
.goodbye_text{
    padding: 5px;
    font-family: "KHMenu";
    font-size: 16px;
}