*{
    box-sizing: border-box;
}
html, body{
    padding: 0;
    margin: 0;
}
body {
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    background-color: lightblue;
    margin: 100px;
}
h1 {
    color: rgb(255, 132, 0);
}
a, a:active, a:visited{
    text-decoration: none;
    transition: 0.3s all;
    color: #333;
}
a:hover{
    color: #f00;
}
header{
    width: 100%;
    background-color: bisque;
    display: flex;
    justify-content: space-between;
    flex-direction: row;
    margin-bottom: 30px;
}
.header_bild{
    max-height: 90px;
}
header nav{
    display: flex;
    flex-direction: row;
    column-gap: 1rem;
    font-size: 1.5rem;
    padding: 15px;
    border-radius: 10px;
    background-color: rgb(27, 89, 89);
    margin: 20px;
}
header nav a, header nav a:visited{
    color: #fff;
} 
header nav a:hover{
    color: #f00;
} 
#page{
    background-color: #fff;
    width: 100%;
    display: flex;
    padding: 50px;
    flex-direction: column;
}
.page_bild{
    max-width: 100px;
    object-fit: contain;
}
footer{
    width: 100%;
    background-color: rgb(85, 68, 239);
    display: flex;
    justify-content: space-between;
    flex-direction: row;
    margin-bottom: 30px;
    color: #fff;
    padding: 20px;
}
.input_demo{
    display: flex;
    flex-direction: column;
    row-gap: 20px;
    background-color: #eee;
    padding: 30px;
    width: 100%;
    max-width: 400px;
    align-content: center;
    justify-content: center;
}
.input_demo input{
    padding: 10px;
}
.input_demo button{
    background-color: rgb(255, 0, 93);
    color: #fff;
    font-size: 1.5rem;
    border: none;
    padding: 10px;
    cursor: pointer;
    transition: 0.3s all ease-in-out;
}
.input_demo button:hover{
    background-color: blue;
}
#param_test{
    display: flex;
    flex-direction: column;
    padding: 50px;
    background-color: #ccc;
}
#param_test img{
    width: 100%;
    max-width: 200px;
    height: auto;
    object-fit: contain;
}
@media screen and (max-width: 800px) {
    body {
      background-color: #0f0;
    }
  }