overleaf/services/web/public/stylesheets/app/login-register.less

@brand-ieee-color       : #00629B;
@brand-google-color     : #276fea; // Not the "official" color but modified for a11y
@brand-twitter-color    : #1DA1F2;
@brand-orcid-color      : #A6CE39;
@brand-sharelatex-color : #A93529;

.login-register-alternatives {
	.form-group:last-child {
		margin-bottom: 0;
	}
}

.login-register-container {
	max-width: 400px;
	margin: 0 auto;
}
	.login-register-header {
		padding-top: @line-height-computed;
		padding-bottom: @line-height-computed - 5;
		border-bottom: solid 1px @hr-border;
	}
		.login-register-header-heading {
			margin: 0;
			color: @text-color;
		}

	.login-register-card {
		padding-top: 0;
		padding-bottom: 0;
		text-align: center;
	}

		.login-register-form,
		.login-register-sharelatex {
			padding: @line-height-computed;
			border-bottom: solid 1px @hr-border;
			&:last-child {
				border-bottom-width: 0;
			}
		}
		.login-register-other-links {
			padding: @line-height-computed;
		}

		.login-register-text,
		.login-register-hr-text-container {
			margin: 0;
		}

		.login-register-text {
			padding-bottom: 25px;
			&:last-child {
				padding-bottom: 0;
			}
		}

		.login-register-hr-text-container {
			line-height: 1;
			position: relative;
			padding: @line-height-computed 0;

			&::before {
				content: '';
				position: absolute;
				height: 1px;
				background-color: @hr-border;
				top: 50%;
				left: 0;
				right: 0;
			}
		}
			.login-register-hr-text {
				position: relative;
				background-color: #FFF;
				padding: 0 (@line-height-computed / 2);
			}
		.login-register-sharelatex-tooltip {
			display: inline-block;
			font-size: 135%;
			position: relative;
			top: 2px;
			margin-left: 3px;
			color: @link-color;
			cursor: pointer;
		}

		.login-register-newsletter {
			font-size: 90%;
			margin-top: @line-height-computed;
			text-align: left;

			& > .checkbox {
				margin-bottom: 0;
			}
		}

		.login-btn {
			.btn;
			.btn-default;
			position: relative;
			padding-left: 20px;
			padding-right: 0;
		}

		.login-btn-sharelatex {
			background-color: @brand-sharelatex-color;
			&:focus,
			&:hover {
				background-color: darken(@brand-sharelatex-color, 8%);
			}
			&:active {
				background-color: darken(@brand-sharelatex-color, 16%);
			}
		} 

			.login-btn-icon {
				position: absolute;
				top: 4px;
				left: 4px;
				background: #FFF url(/img/brand/lion.svg) center/20px no-repeat;
				border-radius: 99999px;
				width: 26px;
				height: 26px;
			
				&::before {
					content: '\00a0'; // Non-breakable space. A non-breakable character here makes this icon work like font-awesome.
				}
			}

			.login-btn-icon-ieee {
				background-image: url(/img/other-brands/logo_ieee.svg);
			}
			.login-btn-icon-google {
				background-image: url(/img/other-brands/logo_google.svg);
			}
			.login-btn-icon-twitter {
				background-image: url(/img/other-brands/logo_twitter.svg);
			}
			.login-btn-icon-orcid {
				background-image: url(/img/other-brands/logo_orcid.svg);
			}
			.login-btn-icon-sharelatex {
				background-size: 22px;
			}

		.login-register-header-heading {
			margin: 0;
			color: @text-color;
		}

.registration-message-heading {
	color: @text-color;	
}

.registration-message-details {
	font-size: 90%;
}