silverstripe-simple/css/form.css

.ui-widget,
.ui-widget input,
.ui-widget select,
.ui-widget textarea,
.ui-widget button {
    font-family: Arial, Helvetica, sans-serif !important
}
input:invalid,
textarea:invalid {
    border-radius: 1px;
    -moz-box-shadow: 0px 0px 5px red;
    -webkit-box-shadow: 0px 0px 5px red;
    box-shadow: 0px 0px 5px red;
}
.no-boxshadow input:invalid,
.no-boxshadow textarea:invalid {
    background-color: #f0dddd
}
form {
    max-width: 70%;
}
form .message {
    float:right;
    padding-top: 6px;
    color:#b80000;
}
.holder-required {
    background-color:#ffb8b8;
}
form .good {
    background-color: #ecf9d0;
    border-color: #8fbe00;
}
form .bad {
    background-color: #f9d0d0;
    border-color: #be0000;
}
.checkbox,
.radio {
    margin-top: 3px;
}
.checkbox label.right,
.radio label.right {
    float:left;
    text-align: left;
}
#MemberLoginForm_LoginForm_action_dologin,
.Actions .action {
    padding: 6px 20px
}
#MemberLoginForm_LoginForm,
#MemberLoginForm_LostPasswordForm {
    max-width: 500px
}
#ForgotPassword a {
    margin-top: 15px
}
#ForgotPassword {
    margin-top: 6px
}
div.field {
    width: 100%;
    float: left;
    margin-bottom: 10px;
    padding:10px;
}

.middleColumn div.field {
	padding-left:0;
	padding-right:0;
}


.ui-widget {
    font-family: Arial, Helvetica, sans-serif
}
form label.left {
    float: left;
    width: 20%;
    padding-right: 5%;
    margin-top: 3px;
    display: block;
    font-size: 13px;
}
form label.right {
    float: right;
    width: 20%;
    padding-left: 5%;
    display: block;
    font-size: 13px;
}
.main form .middleColumn {
    float: left;
    width: 50% !important;
}
	.main form .middleColumn .middleColumn {
	    width: 100% !important
	}
.header form .middleColumn {
    float: none;
    width: 100% !important;
}
.listbox option {
    padding: 3px 0
}
form input.text,
form textarea,
form .textajaxuniquetext,
form select {
    width: 98%;
    padding: 6px 1%;
    font-size: 15px;
    background-color:#fff;
	 border: 1px solid #dad9d9;
}

form input.text:focus,
form textarea:focus,
form .textajaxuniquetext:focus,
form select:focus {
    outline:none;
}

form input.sitetreeurlsegment {
    width: 200px
}
form span.readonly {
    font-size: 16px
}
form input[disabled], form textarea[disabled] {
    background-color: #f7f7f7;
    border: 1px solid #dad9d9;
}
form .creditCardField input,
form input.currency {
    padding: 5px 1%;
    width: 50px;
}
form input.numeric {
    padding: 5px 1%;
    width: 50px;
}
form #DMYDate-month,
form #DMYDate-day {
    width: 25px
}
form .checkboxset ul,
form .optionset ul {
    margin: 0;
}

form .checkboxset li,
form .optionset li {
    margin-bottom: 5px;
    list-style-type:none;
}
form .checkboxset li .checkbox,
form .optionset li .radio{
    margin-top: 1px;
}

a.btn, button, input[type="submit"] {
    background: #b80000;
    color: #fff;
    display: inline-block;
    border-radius: 4px;
    padding: 6px 15px;
    margin-top: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-bottom: none !important;
    font-size: 13px;
	 border:none;
}

a.btn:hover, button, input[type="submit"]:hover {
    background: #d80000;
    color: #fff;
}

button{
	background-color:#a4a4a4;
}

.ss-uploadfield-item-info button{
		margin-top:4px !important;
		float:left;
}

a.btn:after {
    content: '\2192';
    padding-left: 10px;
    font-size: 14px;
    font-family: Arial, Helvetica, sans-serif;
}

.resetformaction {
    float:right;
    border-radius:20px;
    background-color:#9F9F9F;
    border:none;
    color:#fff;
    font-weight: bold;
    font-size: 13px;
}

@media only screen and (max-width: 700px) { 
    .main form .middleColumn {
	    float: right;
	    width: 100% !important;
	    : ;
	}
	.header form .middleColumn {
	    float: none;
	    width: 100% !important;
	    : ;
	}
	form label.left,
	#MemberLoginForm_LoginForm label {
	    margin-bottom: 8px
	}
    div.field {
        position:relative;
        border-bottom:1px solid #E5E5E5;
        padding-bottom: 20px;
    }
    .checkbox label.right,
    .radio label.right {
        float:left;
        text-align: left;
    }
    form label.left {
        width:50%;
        padding:0;
    }
    form label.right {
        position: absolute;
        right: 10px;
        margin-top: 3px;
        width:50%;
        padding:0;
    }
    .checkbox label.right,
    .radio label.right {
        position:relative;
        right:auto;
        margin-top:0;
    }
}

@media only screen and (max-width: 900px) { 
    form {
        max-width: 100%;
    }
}

@media only screen and (min-width: 700px) { 
	#MemberLoginForm_LoginForm #Remember,
	#MemberLoginForm_LoginForm .Actions,
	#MemberLoginForm_LostPasswordForm .Actions {
	    padding-left: 30%
	}
}