index.css

#band {
    width: 100%;
    height: 7px;
    background-color: rgb(4, 166, 255);
    margin-bottom: 50px;
}
h3, h2, h4 {
    margin: 5;
    columns: #ffffff;
    text-align: center;
}
body {
    background-color: #004445;
    background-repeat : no-repeat;
    margin: 0;
    font-family: sans-serif;
    color:white;
}
.container{
    
    margin-left: 10px;
}
button {
  width:auto;
  background-color: rgb(0, 110, 255);
  color: white;
  padding: 10px 8px;
  margin: 8px 0;
  border: none;
  border-radius:8px;
  cursor: pointer;
}
input[type=text], input[type=number] {
  padding: 7px 6px;
  margin: 8px 0;
  display: inline-block;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
}


button:active {
    background-color: rgb(0, 81, 125);
}

button:hover {
    opacity: 0.7;
}