body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-color: #edeeef;
}



#calculator{
    width: 260px;
    border-radius: 16px;
    background-color: #1e2a3a ;
    padding: 16px;
    border: none;
}

#history {
    color: #a0aab4;
    font-size: 13px;
    text-align: left;
    padding: 4px 8px;
    margin-bottom: 6px;
    max-height: 80px;
    overflow-y: auto;
    font-family: 'Poppins', sans-serif;
    display: none;
}
#display {
    width: 100%;
    background: #f0f0f0;
    border-radius: 10px;
    padding: 10px 14px;
    font-size: 28px;
    text-align: left;
    margin-bottom: 14px;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

.button-container{
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;

   
}
.button{
  height: 52px;
  border: none;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  background: #2c3e55;
  color: #e0e0e0;
  font-family: 'Poppins', sans-serif;  
}


.button:hover {
    opacity: 0.85;
     background: #3d5269;

}
.button:active {
    transform: scale(0.95);
}