body {
    background-color: #173464;
}

.container {
    background-color: #ffffff;
    padding: 20px 40px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    max-width: 600px;
    width: 100%;
    margin: 20px auto;
}

h1 {
    text-align: center;
    color: #333333;
    margin-bottom: 20px;
}

button {
    background-color: #4CAF50;
    color: white;
    padding: 10px 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    width: 100%;
}

button:hover {
    background-color: #45a049;
}

.input-group {
    display: flex;
    align-items: center;
}

.input-group button {
    width: 30px;
    height: 30px;
    border: 1px solid #ccc;
    /* background-color: #f8f8f8; */
    background-color: #173464;
    cursor: pointer;
    outline: none;
    display: flex;
    justify-content: center;
    align-items: center;
}

.input-group button:active {
    background-color: #ddd;
}

.input-group input {
    text-align: center;
    border: 1px solid #ccc;
    height: 30px;
    width: 80px;
    margin: 0 5px;
}

.hidden {
    display: none;
}

.visible-input {
    border: 3px solid #173464;
    padding: 5px;
    border-radius: 4px;
    margin-top: 10px;
}

#preview {
    display: none;
    margin-top: 10px;
    max-width: 100%;
    height: auto;
    border: 2px solid #4CAF50;
    border-radius: 4px;
}

#previews {
    display: none;
    margin-top: 10px;
    max-width: 100%;
    height: auto;
    border: 2px solid #4CAF50;
    border-radius: 4px;
}