HTML CSS, JavaScript 计算器

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<div class="center">
        <h1>HTML CSS, JavaScript 计算器</h1>
        <a href="https://github.com/guuibayer/simple-calculator" target="_blank"><i class="fa fa-github"></i></a>
        <form name="calculator">
            <input type="button" id="clear" class="btn other" value="C">
            <input type="text" id="display">
                <br>
            <input type="button" class="btn number" value="7" onclick="get(this.value);">
            <input type="button" class="btn number" value="8" onclick="get(this.value);">
            <input type="button" class="btn number" value="9" onclick="get(this.value);">
            <input type="button" class="btn operator" value="+" onclick="get(this.value);">
                <br>
            <input type="button" class="btn number" value="4" onclick="get(this.value);">
            <input type="button" class="btn number" value="5" onclick="get(this.value);">
            <input type="button" class="btn number" value="6" onclick="get(this.value);">
            <input type="button" class="btn operator" value="*" onclick="get(this.value);">
                <br>
            <input type="button" class="btn number" value="1" onclick="get(this.value);">
            <input type="button" class="btn number" value="2" onclick="get(this.value);">
            <input type="button" class="btn number" value="3" onclick="get(this.value);">
            <input type="button" class="btn operator" value="-" onclick="get(this.value);">
                <br>
            <input type="button" class="btn number" value="0" onclick="get(this.value);">
            <input type="button" class="btn operator" value="." onclick="get(this.value);">
            <input type="button" class="btn operator" value="/" onclick="get(this.value);">         
            <input type="button" class="btn other" value="=" onclick="calculates();">
        </form>
    </div>

HTML

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/* limpa o display */ 
document.getElementById("clear").addEventListener("click", function() {
    document.getElementById("display").value = "";
});
/* recebe os valores */
function get(value) {
    document.getElementById("display").value += value; 
} 
​
/* calcula */
function calculates() {
    var result = 0;
    result = document.getElementById("display").value;
    document.getElementById("display").value = "";
    document.getElementById("display").value = eval(result);
};

JavaScript

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/* Basic Reset */
* {
    border: none;
    font-family: 'Open Sans', sans-serif;
    margin: 0;
    padding: 0;
}
body {
​
}
.center {
    background-color: #fff;
    border-radius: 50%;
    height: 600px;
    margin: auto;
    width: 600px;
}
h1 {
    color: #495678;
    font-size: 30px;    
    margin-top: 20px;
    padding-top: 50px;
    display: block;
    text-align: center;
    text-decoration: none;
}
a {
    color: #495678;
    font-size: 30px;    
    display: block;
    text-align: center;
    text-decoration: none;
    padding-top: 20px;
}
form {
    background-color: #495678;
    box-shadow: 4px 4px #3d4a65;
    margin: 40px auto;
    padding: 40px 0 30px 40px;  
    width: 280px;
}
.btn {
    outline: none;
    cursor: pointer;
    font-size: 20px;
    height: 45px;
    margin: 5px 0 5px 10px;
    width: 45px;
}
.btn:first-child {
    margin: 5px 0 5px 10px;
}
.btn, #display, form {
    border-radius: 25px;
}
#display {
    outline: none;
    background-color: #98d1dc;
    box-shadow: inset 6px 6px 0px #3facc0;
    color: #dededc;
    font-size: 20px;
    height: 47px;
    text-align: right;
    width: 165px;
    padding-right: 10px;
    margin-left: 10px;
}
.number {
    background-color: #72778b;
    box-shadow: 0 5px #5f6680;
    color: #dededc;
}
.number:active {
    box-shadow: 0 2px #5f6680;
    -webkit-transform: translateY(2px);
    -ms-transform: translateY(2px);
    -moz-tranform: translateY(2px);
    transform: translateY(2px);
}
.operator {
    background-color: #dededc;
    box-shadow: 0 5px #bebebe;
    color: #72778b;
}
.operator:active {
    box-shadow: 0 2px #bebebe;
    -webkit-transform: translateY(2px);
    -ms-transform: translateY(2px);
    -moz-tranform: translateY(2px);
    transform: translateY(2px);
}
.other {
    background-color: #e3844c;
    box-shadow: 0 5px #e76a3d;
    color: #dededc;
}
.other:active {
    box-shadow: 0 2px #e76a3d;
    -webkit-transform: translateY(2px);
    -ms-transform: translateY(2px);
    -moz-tranform: translateY(2px);
    transform: translateY(2px);
}

CSS