So here is very easy and ready to use style for contact form 7 using css3.

/********** Contact Form 7 Style *************/
.wpcf7 input[type="text"],
.wpcf7 input[type="email"],
.wpcf7 textarea {
    outline:none;
    display:block;
    width:380px;
    padding:4px 8px;
    border:1px dashed #DBDBDB;
    color:#3F3F3F;
    font-family:'Droid Sans', Tahoma, Arial, Verdana sans-serif;
    font-size:14px;
    /*border-radius*/
    -webkit-border-radius:2px;
    -moz-border-radius:2px;
    border-radius:2px;
    /*transition*/
    -webkit-transition:background 0.2s linear, box-shadow 0.6s linear;
    -moz-transition:background 0.2s linear, box-shadow 0.6s linear;
    -o-transition:background 0.2s linear, box-shadow 0.6s linear;
    transition:background 0.2s linear, box-shadow 0.6s linear;
}
.wpcf7 input[type="submit"],
.wpcf7 input[type="button"] { 
background-color:#725f4c;
width:100%;
text-align:center;
text-transform:uppercase;
}

div#wpcf7-f201-p203-o1{ 
background-color: #fbefde;
border: 1px solid #f28f27;
padding:20px;
}
#wpcf7-f201-p203-o1 input[type="text"],
#wpcf7-f201-p203-o1 input[type="email"],
#wpcf7-f201-p203-o1 textarea {
background:#725f4c;
color:#FFF;
font-family:lora, "Open Sans", sans-serif; 
font-style:italic;    
}
#wpcf7-f201-p203-o1 input[type="submit"],
#wpcf7-f201-p203-o1 input[type="button"] { 
background-color:#725f4c;
width:100%;
text-align:center;
text-transform:uppercase;
}



div.wpcf7 {
    position: relative;
    width: 440px;
    z-index: 100;
    padding: 30px !important;
    border: 1px solid #383838;
    background: #D1D1D1;
    background: -moz-repeating-linear-gradient(-45deg, #EFC1CB, #EFC1CB 30px, #F2F2F2 30px, #F2F2F2 40px, #C2E8F5 40px, #C2E8F5 70px, #F2F2F2 70px, #F2F2F2 80px);
    background: -webkit-repeating-linear-gradient(-45deg, #EFC1CB, #EFC1CB 30px, #F2F2F2 30px, #F2F2F2 40px, #C2E8F5 40px, #C2E8F5 70px, #F2F2F2 70px, #F2F2F2 80px);
    background: -o-repeating-linear-gradient(-45deg, #EFC1CB, #EFC1CB 30px, #F2F2F2 30px, #F2F2F2 40px, #C2E8F5 40px, #C2E8F5 70px, #F2F2F2 70px, #F2F2F2 80px);
    background: repeating-linear-gradient(-45deg, #EFC1CB, #EFC1CB 30px, #F2F2F2 30px, #F2F2F2 40px, #C2E8F5 40px, #C2E8F5 70px, #F2F2F2 70px, #F2F2F2 80px);
    -webkit-border-radius: 8px;
    -moz-border-radius: 8px;
    border-radius: 8px;
    -webkit-box-shadow: 0px 1px 6px #3F3F3F;
    -moz-box-shadow: 0px 1px 6px #3F3F3F;
    box-shadow: 0px 1px 6px #3F3F3F;
}

 div.wpcf7:after {
    background:#F9F9F9;
    margin:10px;
    position: absolute;
    content :" ";
    bottom: 0;
    left: 0;
    right: 0;
    top: 0;
    z-index: -1;
    border:1px #E5E5E5 solid;
    -webkit-border-radius:8px;
    -moz-border-radius:8px;
    border-radius:8px;
}

 input[type=submit] {
    cursor:pointer;
    background:none;
    border:none;
    font-family:'Alice', serif;
    color:#767676;
    font-size:18px;
    padding:10px 4px;
    border:1px solid #E0E0E0;
    text-shadow: 0px 1px 1px #E8E8E8;
    background: rgb(247, 247, 247);
    background: -moz-linear-gradient(top, rgba(247, 247, 247, 1) 1%, rgba(242, 242, 242, 1) 100%);
    background: -webkit-gradient(linear, left top, left bottom, color-stop(1%, rgba(247, 247, 247, 1)), color-stop(100%, rgba(242, 242, 242, 1)));
    background: -webkit-linear-gradient(top, rgba(247, 247, 247, 1) 1%, rgba(242, 242, 242, 1) 100%);
    background: -o-linear-gradient(top, rgba(247, 247, 247, 1) 1%, rgba(242, 242, 242, 1) 100%);
    background: -ms-linear-gradient(top, rgba(247, 247, 247, 1) 1%, rgba(242, 242, 242, 1) 100%);
    background: linear-gradient(top, rgba(247, 247, 247, 1) 1%, rgba(242, 242, 242, 1) 100%);
    -webkit-border-radius:5px;
    -moz-border-radius:5px;
    border-radius:5px;
    -webkit-box-shadow:0px 1px 1px #FFF inset, 0 0 0px 5px #EAEAEA;
    -moz-box-shadow:0px 1px 1px #FFF inset, 0 0 0px 5px #EAEAEA;
    box-shadow:0px 1px 1px #FFF inset, 0 0 0px 5px #EAEAEA;
    -webkit-transition:all 0.2s linear;
    -moz-transition:all 0.2s linear;
    -o-transition:all 0.2s linear;
    transition:all 0.2s linear;
}
input[type=submit]:hover {
    color:#686868;
    border-color: #CECECE;
    background: rgb(244, 244, 244);
    background: -moz-linear-gradient(top, rgba(244, 244, 244, 1) 0%, rgba(242, 242, 242, 1) 100%);
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, rgba(244, 244, 244, 1)), color-stop(100%, rgba(242, 242, 242, 1)));
    background: -webkit-linear-gradient(top, rgba(244, 244, 244, 1) 0%, rgba(242, 242, 242, 1) 100%);
    background: -o-linear-gradient(top, rgba(244, 244, 244, 1) 0%, rgba(242, 242, 242, 1) 100%);
    background: -ms-linear-gradient(top, rgba(244, 244, 244, 1) 0%, rgba(242, 242, 242, 1) 100%);
    background: linear-gradient(top, rgba(244, 244, 244, 1) 0%, rgba(242, 242, 242, 1) 100%);
    -webkit-box-shadow:0px 1px 1px #FFF inset, 0 0 0px 5px #E0E0E0;
    -moz-box-shadow:0px 1px 1px #FFF inset, 0 0 0px 5px #E0E0E0;
    box-shadow:0px 1px 1px #FFF inset, 0 0 0px 5px #E0E0E0;
}
input[type=submit]:active, input[type=submit]:focus {
    position:relative;
    top:1px;
    color:#515151;
    background: rgb(234, 234, 234);
    background: -moz-linear-gradient(top, rgba(234, 234, 234, 1) 0%, rgba(242, 242, 242, 1) 100%);
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, rgba(234, 234, 234, 1)), color-stop(100%, rgba(242, 242, 242, 1)));
    background: -webkit-linear-gradient(top, rgba(234, 234, 234, 1) 0%, rgba(242, 242, 242, 1) 100%);
    background: -o-linear-gradient(top, rgba(234, 234, 234, 1) 0%, rgba(242, 242, 242, 1) 100%);
    background: -ms-linear-gradient(top, rgba(234, 234, 234, 1) 0%, rgba(242, 242, 242, 1) 100%);
    background: linear-gradient(top, rgba(234, 234, 234, 1) 0%, rgba(242, 242, 242, 1) 100%);
    -webkit-box-shadow:0px -1px 1px #FFF inset, 0 0 0px 5px #E0E0E0;
    -moz-box-shadow:0px -1px 1px #FFF inset, 0 0 0px 5px #E0E0E0;
    box-shadow:0px -1px 1px #FFF inset, 0 0 0px 5px #E0E0E0;
}