body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: top;
    height: 100vh;
    background-color: #f4f4f4;
}

.container {
    width: 90%;
    max-width: 600px;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
}

.header input {
    width: 150px;
}

.activity-list {
    margin-bottom: 10px;
}

.activity-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 5px;
}

.activity-item input[type="checkbox"] {
    margin-right: 10px;
}

.activity-item input[type="text"] {
    margin-right: 10px;
}

.activity-item input[type="number"] {
    width: 60px;
    margin-right: 10px;
}

.delete-btn {
    background: red;
    color: white;
    border: none;
    border-radius: 4px;
    padding: 5px;
    cursor: pointer;
}

.add-activity {
    text-align: center;
}

.predefined-activities {
    margin-top: 20px;
}

.predefined-activities h3 {
    margin-bottom: 10px;
}

.predefined-activities ul {
    list-style: none;
    padding: 0;
}

.predefined-activities li {
    display: flex;
    align-items: center;
    margin-bottom: 5px;
}

.predefined-activities span {
    flex-grow: 1;
}

.predefined-activities input[type="text"] {
    width: 60px;
    margin-right: 10px;
    text-align: center;
}

.predefined-activities button {
    background: green;
    color: white;
    border: none;
    border-radius: 4px;
    padding: 5px;
    cursor: pointer;
}