* {
    padding: 0;
    border: none;
}

body {
    background-color: rgb(52, 73, 73);
}

p {
    font-family: monospace;
    font-size: 25px;
    text-align: center;
    font-weight: 500;
    margin: 50px 0;
}

.warning {
    font-family: monospace;
    font-size: 18px;
    text-align: center;
    font-weight: 500;
    margin: 20px 0;
}

div.inside {
    max-width: 310px;
    margin: 0 auto;
    display: flex;
    justify-content: space-around;
    max-width: 50px 0;
}

#input {
    width: 250px;
    display: block;
    border-radius: 10px;
    height: 25px;
    border: 1.5px solid gray;
}

#button {
    width: 60px;
    display: block;
    border-radius: 10px;
    border: 1.5px solid gray;
}

h3 {
    text-align: center;
    margin: 50px 0 35px 0;
    font-family: sans-serif;
    font-weight: 500;
    padding: 0;      
}

ul {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

ul> li {
    width: 50px;
    font-family:'Franklin Gothic Medium', 'Arial Narrow', Arial, sans-serif;
    font-weight: 500;
    list-style-type: none;
    text-align: center;
}

button:active {
    background-color: gray;
}

input::placeholder {
    padding: 0 5px;
}

.upper {
    display: flex;
    justify-content: space-between;
    padding: 0 5px;
    
}

.upper > button {
    padding: 0;
    border-radius: 5px;
    background-color: transparent;
}

#display {
    font-size: 35px;
    font-weight: 900;
    color: gray;
}

#history {
    font-family: Georgia, 'Times New Roman', Times, serif;
    font-size: 18px;
    font-weight: 500;
}

#history:active, ol > li:active{
    color: green;
}

ol>li {
    list-style-type: disc;
    padding: 2px;
    margin-top: 5px;
    margin-left: 20px;
}