html {
    height: 100%;
}

body {
    margin: 0;
    height: 100%;
    background-image: url('../images/background.jpg');
    background-size: cover; 
    background-repeat: no-repeat;
    background-position: center;
    background-attachment: fixed;
    background-color: #ccc;
    font-family: "Noto Sans JP", sans-serif;
    user-select: none;
}

input[type="text"]:focus {
    outline: none;
    box-shadow: none;
    border-color: transparent;
}

input::placeholder {
  opacity: 0.5;
}