* 
{
    margin:0;
    padding:0;
    box-sizing:border-box;
}
body 
{
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    gap:20px;
}
.container
{
    background : white;
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    width: 320 px;
}
#display 
{
    background : #222;
    color: white;
    font-size: 36px ;
    padding: 20px;
    text-align: right;
    border-radius: 10px;
    margin-bottom: 15px;
    min-height: 60px;
    word-wrap: break-word;
}
.buttons 
{
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.button-row 
{
    display: flex;
    gap: 10px;
}
button 
{
    flex: 1;
    padding: 20px;
    font-size: 20px;
    border: 0.2px solid #222;
    border-radius: 10px;
    background : #f0f0f0;
    box-shadow: 10px 10px 20px rgba(0,0,0,0.2);
    cursor: pointer;
    transition: all 0.2s; 
}
button:hover 
{
    background: #e0e0e0;
    transform: scale(1.05);
}
button:active 
{
    transform: scale(0.95);
}
#history-container 
{
    background: white;
    border-radius:12px;
    padding: 16px;
    width:200px;
    max-height:400px;
    overflow-y:auto;
}
h3
{
    margin: 0 0 10px 0;
    font-size:25px;
    color: #333;
}
#history-list
{
    list-style: none;
    padding: 0;
    margin: 0;
}
#history-list li 
{
    padding: 6px 0;
    border-bottom: 2px solid #eee;
    color: #555;
}
.layout
{
    display: flex;
    align-items: flex-start;
    gap:20px;
}
.history-wrapper
{
    display: flex;
    flex-direction: column;
    width: 200px;
    margin-top:115px;
}