body{font-family:Avenir,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-align:center;background:linear-gradient(to bottom right,#f7f7f7,#393e46);color:#2c3e50}*,body{margin:0;padding:0}*{box-sizing:border-box}.container{position:relative;width:100%;height:100vh;display:flex;justify-content:center;align-items:center}.box-calculator{border:1px solid #333;padding:20px 20px 40px 20px;width:350px;height:620px;border-radius:15px;background:linear-gradient(145deg,#000,#333)}#display-calculator{height:35%;padding:10px 20px;background-color:#393e46;border-radius:15px;margin-bottom:20px;color:#f7f7f7}.history-calculator{height:80%;text-align:end;overflow-y:auto;padding-right:10px;margin-bottom:10px;color:#f7f7f7}.history-calculator::-webkit-scrollbar{width:8px;border-radius:4px;background-color:#333}.history-calculator::-webkit-scrollbar-thumb{background-color:#393e46}.result-calculator{text-align:end;font-size:30px;padding-right:10px;color:#f7f7f7}.buttons-calculator{background-color:#000;padding:10px 0;border-radius:15px}.buttons-calculator button{width:60px;height:60px;border-radius:50%;margin:4px 7px;border:1px solid #f7f7f7;background-color:#333;font-size:20px;font-weight:550;color:#f7f7f7;cursor:pointer}.buttons-calculator button:hover{background-color:#f7f7f7;color:#000}