* {
    font-family: 'Courier New', Courier, monospace;
    font-weight: bold;
    box-sizing: border-box;
}

.navbar {
    display: flex;
    align-items: center;    
    width: 100%;
    background: #eee;
    padding: 5px;    
}
.navbar > div {
    margin-right: 10px;
}

.modal {
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: lightgrey;
    visibility: hidden;        
}
.modal-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: white;
    padding: 1rem 1.5rem;    
    width: 25rem;    
    border-radius: 0.5rem;
}
.close-button {
    float: right;
    width: 1.5rem;
    line-height: 1.5rem;
    text-align: center;
    cursor: pointer;
    border-radius: 1rem;
    background-color: lightgrey;
}
.close-button:hover {
    background-color: blue;
    color: white;
}
.show-modal {
    opacity: 0.9;
    visibility: visible;       
}

.modal-content input, .modal-content button {
    margin: 10px 0;
}

.error {    
    color: red;
}

button {
    background-color: blue;
    color: white;
    border: none;
    padding:10px;
    font-size: 1.1rem;
    border-radius: 5px;
}

input {
    font-size: 1.1rem;
}

.msg {
    background-color: lightgrey;    
    border: none;
    padding:10px;
    margin:10px 0;
    font-size: 1.1rem;
    border-radius: 5px;
}

#btnAddItem {    
    visibility: hidden;        
}

#btnAddItem.show-button {    
    visibility: visible;       
}