styles.css

/* Style the header */
body {
    font-family: Arial, Helvetica, sans-serif;
    margin: 0;
    background: #1abc9c;
    font-size: 20px;
  }

.header {
    /* padding: 100px; */
    text-align: center;
    background: #1abc9c;
    color: white;
  }
  
  /* Increase the font size of the h1 element */
  .header h1 {
    font-size: 100px;
  }
.whiteflag{
    display:none;
    width: 100px;
    height: 150px;
    position: absolute ;
}
.button:active ~ .whiteflag{
  display: block;
  position: absolute;
}
  input[type=text] {
    padding:5px; 
    border:2px solid #ccc; 
    position: relative;
    -webkit-border-radius: 5px;
    border-radius: 5px;
    color: grey ;
}

input[type=text]:focus {
    border-color:#1abc9c;
}
input[type = submit]{
  width: 100%;
  padding: 12px 20px;
  margin: 8px 0;
  box-sizing: border-box;
  background-color: white;
  color: #1abc9c;

}
img{
  width: 300px;
 height: 200px;
 
}

.button, .form-submit-button{
  display: inline-block;
  padding: 10px 15px;
  font-size: 15px;
  position: relative;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  outline: none;
  color: #fff;
  background-color: #abcfbd;
  border: none;
  border-radius: 15px;
    /*box-shadow: 0 9px #999; */
  }
  
  .button:hover {background-color: #7dcaca}
  
  .button:active {
  background-color: #7dcaca;
    /*box-shadow: 0 5px #666;
    //transform: translateY(4px); */
  }

  input[type="radio"] {
    background-color: #ddd;
    background-image: -webkit-linear-gradient(0deg, transparent 20%, hsla(0,0%,100%,.7), transparent 80%),
                      -webkit-linear-gradient(90deg, transparent 20%, hsla(0,0%,100%,.7), transparent 80%);
    border-radius: 10px;
    cursor: pointer;
    display: inline-block;
    height: 15px;
    margin-right: 15px;
    position: relative;
    width: 15px;
    -webkit-appearance: none;
}

input[type="radio"]:checked {
  background-color: #1abc9c;
}

#username {
  font-size: 18px;
  font-weight: bold;
  text-align: center;
}
#username span {
  font-size: 24px;
  text-align: center;
  /* margin-left: 2.5em; */
  padding: 0 0em 0.5em 0;
  /* border-width: 2px; */
  /* border-color: black; 
  border-style:solid; */
}
#myBoard {
  margin: 0 auto;
  
}
#fish_button {
  text-align: center;
  padding: 0 0em 1em 0;
  margin: 0 auto;
}
#username {
  font-size: 18px;
  font-weight: bold;
  text-align: center;
}
#username span {
  font-size: 24px;
  text-align: center;
  /* margin-left: 2.5em; */
  padding: 0 0em 0.5em 0;
  /* border-width: 2px; */
  /* border-color: black; 
  border-style:solid; */
}