styles.css

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', Arial, Helvetica, sans-serif;
    height: 100vh;
    color: #757575;
    background-color: #fafafa;
}

ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

button {
    background: 0 0;
    border: none;
    border-radius: 2px;
    color: #757575;
    position: relative;
    height: 36px;
    margin: 0;
    min-width: 64px;
    padding: 0 16px;
    display: inline-block;
    font-family: 'Roboto', Helvetica, Arial, sans-serif;
    font-size: 14px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0;
    overflow: hidden;
    will-change: box-shadow;
    transition: box-shadow .2s cubic-bezier(.4,0,1,1),background-color .2s cubic-bezier(.4,0,.2,1),color .2s cubic-bezier(.4,0,.2,1);
    outline: none;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    line-height: 36px;
    vertical-align: middle;
}

button:hover {
    background-color: rgba(158,158,158,.2);
}

button:active {
    background-color: rgba(158,158,158,.4);
}

button.icon {
    border-radius: 50%;
    font-size: 24px;
    height: 32px;
    margin-left: 0;
    margin-right: 0;
    min-width: 32px;
    width: 32px;
    padding: 0;
    overflow: hidden;
    line-height: normal;
}

button.icon .material-icons {
    position: absolute;
    top: 50%;
    left: 50%;
    -webkit-transform: translate(-12px,-12px);
    transform: translate(-12px,-12px);
    line-height: 24px;
    width: 24px;
    vertical-align: middle;
}

button[disabled] {
    color: rgba(0,0,0,.26);
    cursor: default;
    background-color: transparent;
}

input {
    font-size: 16px;
    color: #757575;
    background-color: #fafafa;
    font-family: 'Roboto', Arial, Helvetica, sans-serif;
    padding: .25em;
    border: 1px solid lightgray;
    border-radius: 2px;
    outline: none;
}