style.css

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial;
}

.header {
    overflow: hidden;
    background-color: rgb(241, 73, 12);
}

.header a {
    float: left;
    color: black;
    text-align: center;
    padding: 12px;
    text-decoration: none;
    font-size: 16px;
    line-height: 25px;
    border-radius: 4px;
}

.header a.logo {
    font-size: 25px;
    font-weight: bold;
}

.header a:hover {
    background-color: #ddd;
    color: black;
}

.header a.active {
    background-color: rgb(158, 179, 201);
    color: white;
}

.header-right {
    float: left;
}

.container {
    border-radius: 5px;
    background-color: #f2f2f2;
    padding: 20px;
}

.col-25 {
    float: left;
    width: 25%;
    margin-top: 6px;
}

.col-75 {
    float: left;
    width: 75%;
    margin-top: 6px;
}

input, select {
    width: 50%;
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 4px;
    resize: vertical;
}

label {
    margin-left: 20px;
    padding: 12px 12px 12px 0;
    display: inline-block;
}

button {
    margin-left: 20px;
    width: 100px;
    height: 40px;
    background-color: #619ce9;
    border: 0px;
    box-shadow: 0 2px rgb(243, 239, 239);
}

button:hover {background-color: #826cfd}

button:active {
  background-color: #826cfd;
  box-shadow: 0 1px #666;
  transform: translateY(1px);
}

@media screen and (max-width: 500px) {
    .header a {
        float: none;
        display: block;
        text-align: left;
    }
    .header-right {
        float: none;
    }
}