* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
    display: flex;
    justify-content: center;
    align-content: center;
    min-height: 100vh;
    background: #e0e3ed;
}
.container{
    margin-top: 75px;
    position: relative;
    max-width: 100vh;
    width: 300px;
    height: 450px;
    border-radius: 12px;
    padding: 20px 20px 20px;
    background: #09d6f1;

}
.watermark{
    text-align: right;
    
}

.input{
    height: 80px;
    width: 100%;
    outline: none;
    border: none;
    text-align: right;
    padding-right: 15px;
    background-color: #384d40;
    margin-bottom: 10px;
    font-size: 30px;
    color: #00ff22;
}
.button{
    display: grid;
    grid-gap: 10px;
    grid-template-columns: repeat(4, 1fr);
}
.button button{
    width: 100%;
    height: 50px;
    border-radius: 10px;
    border: none;
    cursor: pointer;
    font-size: 20px;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #eee;
}
.button button:active{
    transform: scale(0.99);
}
.operator{
    color: rgb(253, 0, 190);
}
.ac,
.del{
    color: rgb(255, 0, 0);
    
}