body {
    font-family: Arial, sans-serif;
    background-color: #4169E1;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}
.container {
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    width: 300px;
    text-align: center;
}
.tab {
    display: flex;
    justify-content: space-around;
    margin-bottom: 10px;
}
.tab button {
    background: none;
    border: none;
    cursor: pointer;
    font-weight: bold;
}
.tab button.active {
    color: #4169E1;
    border-bottom: 2px solid #4169E1;
}
form {
    display: none;
}
form.active {
    display: block;
}
input {
    width: 100%;
    padding: 8px;
    margin: 5px 0;
    border: 1px solid #ccc;
    border-radius: 5px;
}
button {
    width: 100%;
    padding: 10px;
    background-color: #4169E1;
    color: black;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}
button:hover {
    background-color: #2b3653;
    color: #f3f3f3;
}
#spinner {
    border: 16px solid #f3f3f3;
    border-top: 16px solid #3498db;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    animation: spin .5s linear infinite;
}
.spinner{
    display: none;
    justify-content: center;
    align-items: center;
    margin-top: 20px;
    width: 100%;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}