*{
    box-sizing: border-box;
}
html{
    background-color: #eae9e9;
}
#body{
    background-color: red;
}
#container ul ul input {
    width: 95%;
    height: 40px;
    font-size: 30px;
    margin-top: 5px;
    border-radius: 5px;
    border: 2px inset tomato;
}
#clear{
    width:45% !important;
}
#container{
    position: absolute;
    top: 50%;
    left: 50%;
    margin-top: -200px;
    margin-left: -150px;
    border-right: 1px outset white;
    border-bottom: 1px outset white;
    border-radius: 2px;
}
#container ul{
    padding: 0px;
    background-color: rgb(141, 154, 142);
    margin: 0 auto;
    text-align: center;
    width: 300px;
}
#container ul li{
    text-align: center;
    border: 2px outset tomato;
    font-size: 30px;
    position: relative;
    padding-top: 12px;
    display: inline-block;
    background-color: lightgrey;
    border-radius: 5px;
    margin: 5px;
    width: 60px;
    height: 60px;
    user-select: none;
    cursor: default;
}
#container ul li:active{
    border: 2px inset tomato;
}