input.expand {
    outline: none;
}
input.expand[type=search] {
    -webkit-appearance: textfield;
    -webkit-box-sizing: content-box;
    font-family: inherit;
    font-size: 100%;
}
input.expand::-webkit-search-decoration,
input.expand::-webkit-search-cancel-button {
    display: none; 
}


input.expand[type=search] {
    background: #ededed url(http://static.tumblr.com/ftv85bp/MIXmud4tx/search-icon.png) no-repeat 9px center;
    border: solid 1px #ccc;
    padding: 9px 10px 9px 32px;
    width: 100px;
    
    -webkit-border-radius: 10em;
    -moz-border-radius: 10em;
    border-radius: 10em;
    
    -webkit-transition: all .5s;
    -moz-transition: all .5s;
    transition: all .5s;
}
input.expand[type=search]:focus {
    width: 300px;
    background-color: #fff;
    border-color: #66CC75;
    
    -webkit-box-shadow: 0 0 5px rgba(109,207,246,.5);
    -moz-box-shadow: 0 0 5px rgba(109,207,246,.5);
    box-shadow: 0 0 5px rgba(109,207,246,.5);
}


input.expand:-moz-placeholder {
    color: #999;
}
input.expand::-webkit-input-placeholder {
    color: #999;
}