body {
    background-color: #ffffff; /* Light gray background as seen in the image */
}

/* Navigation Bar Styling */
.navbar {
    background-color: #ffffff; /* White background for the navbar */
    border-bottom: 1px solid #dee2e6; /* Light border at the bottom */
    padding: 0.5rem 1rem;
}

.navbar-brand {
    font-size: 1.25rem;
    font-weight: bold;
    color: #212529; /* Dark text color */
}

.nav-link {
    color: #6c757d; /* Muted text color for links */
}

.nav-link:hover {
    color: #007bff; /* Blue on hover */
}

/* Sub-navigation/Tabs Styling */
.nav-tabs {
    border-bottom: 1px solid #dee2e6;
    margin-bottom: 1rem;
}

.nav-tabs .nav-link {
    border: 1px solid transparent;
    border-top-left-radius: 0.25rem;
    border-top-right-radius: 0.25rem;
    color: #6c757d;
}

.nav-tabs .nav-link.active {
    color: #495057;
    background-color: #fff;
    border-color: #dee2e6 #dee2e6 #fff;
}

/* Main Heading Styling */
.main-heading {
    font-size: 2rem;
    font-weight: normal;
    text-align: center;
    margin-bottom: 2rem;
}

/* Button Styling */
.btn-primary {
    background-color: #007bff; /* Blue primary button */
    border-color: #007bff;
    border-radius: 0.25rem; /* Slightly rounded corners */
    padding: 0.75rem 1.5rem; /* Larger padding */
    font-size: 1.25rem;
}

.btn-secondary {
    background-color: #6c757d; /* Example secondary button color */
    border-color: #6c757d;
    border-radius: 0.25rem;
    padding: 0.75rem 1.5rem;
    font-size: 1.25rem;
}

/* Exercise Selection Section Styling */
.exercise-selection {
    border: 1px solid #dee2e6;
    border-radius: 0.25rem;
    padding: 1rem;
    background-color: #ffffff;
    width: 300px; /* Example width, adjust as needed */
    margin: 0 auto; /* Center the block */
}

.exercise-selection .form-control {
    margin-bottom: 0.5rem;
}

.exercise-list .list-group-item {
    border: none;
    padding: 0.5rem 0.75rem;
    cursor: pointer;
}

.exercise-list .list-group-item:hover {
    background-color: #e9ecef;
}

.popover {
    max-width: 600px;
}